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Vulnerability from cleanstart
Published
2026-06-08 14:58
Modified
2026-06-02 09:20
Summary
Security fixes for CVE-2024-35195, CVE-2024-47081, CVE-2025-8869, CVE-2026-1703, CVE-2026-25645, CVE-2026-3219, CVE-2026-44431, CVE-2026-44432, CVE-2026-45409, CVE-2026-48710, CVE-2026-6357, ghsa-58qw-9mgm-455v, ghsa-65pc-fj4g-8rjx, ghsa-jp4c-xjxw-mgf9, ghsa-mf9v-mfxr-j63j, ghsa-qccp-gfcp-xxvc applied in versions: 1.25.2-r0, 2.2.3-r0, 2.2.3-r1
Details
Multiple security vulnerabilities affect the k8s-sidecar package. These issues are resolved in later releases. See references for individual vulnerability details.
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"url": "https://osv.dev/vulnerability/CVE-2026-44431"
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-35195"
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"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47081"
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"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-8869"
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"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-1703"
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"schema_version": "1.7.3",
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CVE-2025-8869 (GCVE-0-2025-8869)
Vulnerability from cvelistv5 – Published: 2025-09-24 14:56 – Updated: 2025-11-03 17:45
VLAI?
EPSS
Title
Fallback tar extraction in pip doesn't check symbolic links point to extraction directory
Summary
When extracting a tar archive pip may not check symbolic links point into the extraction directory if the tarfile module doesn't implement PEP 706.
Note that upgrading pip to a "fixed" version for this vulnerability doesn't fix all known vulnerabilities that are remediated by using a Python version that implements PEP 706.
Note that this is a vulnerability in pip's fallback implementation of tar extraction for Python versions that don't implement PEP 706
and therefore are not secure to all vulnerabilities in the Python 'tarfile' module. If you're using a Python version that implements PEP 706
then pip doesn't use the "vulnerable" fallback code.
Mitigations include upgrading to a version of pip that includes the fix, upgrading to a Python version that implements PEP 706 (Python >=3.9.17, >=3.10.12, >=3.11.4, or >=3.12),
applying the linked patch, or inspecting source distributions (sdists) before installation as is already a best-practice.
Severity ?
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Packaging Authority | pip |
Affected:
0 , < 25.3
(python)
|
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CVE-2024-35195 (GCVE-0-2024-35195)
Vulnerability from cvelistv5 – Published: 2024-05-20 20:14 – Updated: 2025-07-31 03:56
VLAI?
EPSS
Title
Requests `Session` object does not verify requests after making first request with verify=False
Summary
Requests is a HTTP library. Prior to 2.32.0, when making requests through a Requests `Session`, if the first request is made with `verify=False` to disable cert verification, all subsequent requests to the same host will continue to ignore cert verification regardless of changes to the value of `verify`. This behavior will continue for the lifecycle of the connection in the connection pool. This vulnerability is fixed in 2.32.0.
Severity ?
5.6 (Medium)
CWE
- CWE-670 - Always-Incorrect Control Flow Implementation
Assigner
References
| URL | Tags | |
|---|---|---|
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CVE-2026-6357 (GCVE-0-2026-6357)
Vulnerability from cvelistv5 – Published: 2026-04-27 14:19 – Updated: 2026-04-27 22:17
VLAI?
EPSS
Title
pip self-update functionality can import newly installed modules after wheel installation
Summary
pip prior to version 26.1 would run self-update check functionality after installing wheel files which required importing well-known Python modules names. These module imports were intentionally deferred to increase startup time of the pip CLI. The patch changes self-update functionality to run before wheels are installed to prevent newly-installed modules from being imported shortly after the installation of a wheel package. Users should still review package contents prior to installation.
Severity ?
CWE
- CWE-829 - Inclusion of Functionality from Untrusted Control Sphere
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Pip maintainers | pip |
Affected:
0 , < 26.1
(python)
|
Credits
Damian Shaw
Damian Shaw
Richard Si
Seth Larson
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CVE-2026-45409 (GCVE-0-2026-45409)
Vulnerability from cvelistv5 – Published: 2026-06-05 22:06 – Updated: 2026-06-08 16:34
VLAI?
EPSS
Title
Internationalized Domain Names in Applications (IDNA): Specially crafted inputs to idna.encode() can bypass CVE-2024-3651 fix
Summary
Internationalized Domain Names in Applications (IDNA) for Python provides support for Internationalized Domain Names in Applications (IDNA) and Unicode IDNA Compatibility Processing. In versions prior to 3.15, payloads such as `"\u0660" * N` or `"\u30fb" * N + "\u6f22"` utilize the `valid_contexto` function prior to length rejection, and for high values of `N` will take a long time to process. This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. A specially crafted argument to the `idna.encode()` function could consume significant resources. This may lead to a denial-of-service. Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support). A workaround is available. Domain names cannot exceed 253 characters in length. If this length limit is enforced prior to passing the domain to the `idna.encode()` function, it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application.
Severity ?
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
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CVE-2026-3219 (GCVE-0-2026-3219)
Vulnerability from cvelistv5 – Published: 2026-04-20 14:55 – Updated: 2026-04-20 20:15
VLAI?
EPSS
Title
pip doesn't reject concatenated ZIP and tar archives
Summary
pip handles concatenated tar and ZIP files as ZIP files regardless of filename or whether a file is both a tar and ZIP file. This behavior could result in confusing installation behavior, such as installing "incorrect" files according to the filename of the archive. New behavior only proceeds with installation if the file identifies uniquely as a ZIP or tar archive, not as both.
Severity ?
CWE
- CWE-434 - Unrestricted Upload of File with Dangerous Type
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Packaging Authority | pip |
Affected:
0 , < 26.1
(python)
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CVE-2026-48710 (GCVE-0-2026-48710)
Vulnerability from cvelistv5 – Published: 2026-05-26 21:54 – Updated: 2026-07-02 12:04
VLAI?
EPSS
Title
Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks
Summary
Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP `Host` request header was not validated before being used to reconstruct `request.url`. Because the routing algorithm relies on the raw HTTP path while `request.url` is rebuilt from the `Host` header, a malformed header could make `request.url.path` differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on `request.url` (rather than the raw `scope` path) could therefore be bypassed. Users should upgrade to a version greater than or equal to version 1.0.1, which validates the `Host` header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing `request.url` and falls back to `scope["server"]` for malformed values.
Severity ?
6.5 (Medium)
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
| URL | Tags | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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CVE-2026-44431 (GCVE-0-2026-44431)
Vulnerability from cvelistv5 – Published: 2026-05-13 15:20 – Updated: 2026-06-26 11:01
VLAI?
EPSS
Title
urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
Summary
urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.
Severity ?
CWE
- CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
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CVE-2026-44432 (GCVE-0-2026-44432)
Vulnerability from cvelistv5 – Published: 2026-05-13 15:17 – Updated: 2026-07-02 12:04
VLAI?
EPSS
Title
urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API
Summary
urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.
Severity ?
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
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CVE-2024-47081 (GCVE-0-2024-47081)
Vulnerability from cvelistv5 – Published: 2025-06-09 17:57 – Updated: 2025-06-09 18:40
VLAI?
EPSS
Title
Requests vulnerable to .netrc credentials leak via malicious URLs
Summary
Requests is a HTTP library. Due to a URL parsing issue, Requests releases prior to 2.32.4 may leak .netrc credentials to third parties for specific maliciously-crafted URLs. Users should upgrade to version 2.32.4 to receive a fix. For older versions of Requests, use of the .netrc file can be disabled with `trust_env=False` on one's Requests Session.
Severity ?
5.3 (Medium)
CWE
- CWE-522 - Insufficiently Protected Credentials
Assigner
References
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CVE-2026-25645 (GCVE-0-2026-25645)
Vulnerability from cvelistv5 – Published: 2026-03-25 17:02 – Updated: 2026-03-25 22:48
VLAI?
EPSS
Title
Requests has Insecure Temp File Reuse in its extract_zipped_paths() utility function
Summary
Requests is a HTTP library. Prior to version 2.33.0, the `requests.utils.extract_zipped_paths()` utility function uses a predictable filename when extracting files from zip archives into the system temporary directory. If the target file already exists, it is reused without validation. A local attacker with write access to the temp directory could pre-create a malicious file that would be loaded in place of the legitimate one. Standard usage of the Requests library is not affected by this vulnerability. Only applications that call `extract_zipped_paths()` directly are impacted. Starting in version 2.33.0, the library extracts files to a non-deterministic location. If developers are unable to upgrade, they can set `TMPDIR` in their environment to a directory with restricted write access.
Severity ?
4.4 (Medium)
CWE
- CWE-377 - Insecure Temporary File
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
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CVE-2026-1703 (GCVE-0-2026-1703)
Vulnerability from cvelistv5 – Published: 2026-02-02 14:43 – Updated: 2026-02-02 17:21
VLAI?
EPSS
Title
Limited path traversal when installing wheel archives
Summary
When pip is installing and extracting a maliciously crafted wheel archive, files may be extracted outside the installation directory. The path traversal is limited to prefixes of the installation directory, thus isn't able to inject or overwrite executable files in typical situations.
Severity ?
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Python Packaging Authority | pip |
Affected:
0 , < 26.0
(python)
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GHSA-58QW-9MGM-455V
Vulnerability from github – Published: 2026-04-20 18:31 – Updated: 2026-05-20 20:54
VLAI?
Summary
pip has an interpretation conflict due to handling both concatenated tar and ZIP files as ZIP files
Details
pip handles concatenated tar and ZIP files as ZIP files regardless of filename or whether a file is both a tar and ZIP file. This behavior could result in confusing installation behavior, such as installing "incorrect" files according to the filename of the archive. New behavior only proceeds with installation if the file identifies uniquely as a ZIP or tar archive, not as both.
Severity ?
{
"affected": [
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"id": "GHSA-58qw-9mgm-455v",
"modified": "2026-05-20T20:54:23Z",
"published": "2026-04-20T18:31:48Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3219"
},
{
"type": "WEB",
"url": "https://github.com/pypa/pip/issues/13867"
},
{
"type": "WEB",
"url": "https://github.com/pypa/pip/pull/13870"
},
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"type": "PACKAGE",
"url": "https://github.com/pypa/pip"
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"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/QAJ5JIVWWCAJ4EZL2FP5MOOW35JS7LRJ"
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GHSA-JP4C-XJXW-MGF9
Vulnerability from github – Published: 2026-04-27 15:30 – Updated: 2026-05-05 22:05
VLAI?
Summary
pip Vulnerable to Inclusion of Functionality from Untrusted Control Sphere
Details
pip prior to version 26.1 would run self-update check functionality after installing wheel files which required importing well-known Python modules names. These module imports were intentionally deferred to increase startup time of the pip CLI. The patch changes self-update functionality to run before wheels are installed to prevent newly-installed modules from being imported shortly after the installation of a wheel package. Users should still review package contents prior to installation.
Severity ?
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"ecosystem": "PyPI",
"name": "pip"
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"aliases": [
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"cwe_ids": [
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"github_reviewed": true,
"github_reviewed_at": "2026-05-05T22:05:46Z",
"nvd_published_at": "2026-04-27T15:16:20Z",
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},
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"id": "GHSA-jp4c-xjxw-mgf9",
"modified": "2026-05-05T22:05:46Z",
"published": "2026-04-27T15:30:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6357"
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{
"type": "WEB",
"url": "https://github.com/pypa/pip/pull/13923"
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{
"type": "WEB",
"url": "https://github.com/pypa/pip/commit/b369bfc96cc524e00c267e1693290e6599c36bad"
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"url": "https://github.com/pypa/pip"
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GHSA-65PC-FJ4G-8RJX
Vulnerability from github – Published: 2026-05-19 14:34 – Updated: 2026-06-09 11:57
VLAI?
Summary
Internationalized Domain Names in Applications (IDNA): Specially crafted inputs to idna.encode() can bypass CVE-2024-3651 fix
Details
This is the same issue as CVE-2024-3651, however the original remediation in 2024 was not a complete fix. Payloads such as "\u0660" * N or "\u30fb" * N + "\u6f22" utilize the valid_contexto function prior to length rejection, and for high values of N will take a long time to process.
Impact
A specially crafted argument to the idna.encode() function could consume significant resources. This may lead to a denial-of-service.
Patches
Starting in version 3.14, the function rejects long inputs as soon as practicable prior to any further processing to minimize resource consumption. In version 3.15, this approach was extended to lesser used alternate functions (i.e. per-label conversions and codec support).
Workarounds
Domain names cannot exceed 253 characters in length, if this length limit is enforced prior to passing the domain to the idna.encode() function it should no longer consume significant resources. This is triggered by arbitrarily large inputs that would not occur in normal usage, but may be passed to the library assuming there is no preliminary input validation by the higher-level application.
Severity ?
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"package": {
"ecosystem": "PyPI",
"name": "idna"
},
"ranges": [
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"events": [
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"cwe_ids": [
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],
"github_reviewed": true,
"github_reviewed_at": "2026-05-19T14:34:32Z",
"nvd_published_at": "2026-06-05T23:16:43Z",
"severity": "MODERATE"
},
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"id": "GHSA-65pc-fj4g-8rjx",
"modified": "2026-06-09T11:57:15Z",
"published": "2026-05-19T14:34:32Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/kjd/idna/security/advisories/GHSA-65pc-fj4g-8rjx"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45409"
},
{
"type": "PACKAGE",
"url": "https://github.com/kjd/idna"
}
],
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"type": "CVSS_V4"
}
],
"summary": "Internationalized Domain Names in Applications (IDNA): Specially crafted inputs to idna.encode() can bypass CVE-2024-3651 fix"
}
GHSA-MF9V-MFXR-J63J
Vulnerability from github – Published: 2026-05-11 14:51 – Updated: 2026-06-08 19:52
VLAI?
Summary
urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API
Details
Impact
urllib3's streaming API is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once.
urllib3 can perform decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd). When using the streaming API since version 2.6.0, the library decompresses only the necessary bytes, enabling partial content consumption.
However, urllib3 before version 2.7.0 could still decompress the whole response instead of the requested portion in two cases:
1. During the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library.
2. When HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here).
These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data; CWE-409) on the client side.
Affected usages
Applications and libraries using urllib3 versions earlier than 2.7.0 may be affected when streaming compressed responses from untrusted sources in either of these cases, unless decompression is explicitly disabled:
- A response encoded with
bris read incrementally with at least twoHTTPResponse.read(amt=N)orHTTPResponse.stream(amt=N)calls while using the official Brotli library. HTTPResponse.drain_conn()is called after response decompression has already started.
Remediation
Upgrade to at least urllib3 version 2.7.0 in which the library:
1. Is more efficient for reads with Brotli.
2. Always skips decompression for HTTPResponse.drain_conn().
If upgrading is not immediately possible, the following workarounds may reduce exposure in specific cases:
1. For the Brotli-specific issue only, switch from brotli to brotlicffi until you can upgrade urllib3; the official Brotli package is affected because of https://github.com/google/brotli/issues/1396.
2. If your code explicitly calls HTTPResponse.drain_conn(), call HTTPResponse.close() instead when connection reuse is not important.
Credits
The Brotli-specific issue was reported by @kimkou2024.
HTTPResponse.drain_conn() inefficiency was reported by @Cycloctane.
Severity ?
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"ecosystem": "PyPI",
"name": "urllib3"
},
"ranges": [
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"events": [
{
"introduced": "2.6.0"
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{
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}
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"type": "ECOSYSTEM"
}
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}
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"aliases": [
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],
"database_specific": {
"cwe_ids": [
"CWE-409"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-11T14:51:45Z",
"nvd_published_at": "2026-05-13T16:16:57Z",
"severity": "HIGH"
},
"details": "### Impact\n\nurllib3\u0027s [streaming API](https://urllib3.readthedocs.io/en/2.7.0/advanced-usage.html#streaming-and-i-o) is designed for the efficient handling of large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once.\n\nurllib3 can perform decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API since version 2.6.0, the library decompresses only the necessary bytes, enabling partial content consumption.\n\nHowever, urllib3 before version 2.7.0 could still decompress the whole response instead of the requested portion in two cases:\n1. During the second `HTTPResponse.read(amt=N)` call when the response was decompressed using the official [Brotli](https://pypi.org/project/brotli/) library.\n2. When `HTTPResponse.drain_conn()` was called after the response had been read and decompressed partially (compression algorithm did not matter here).\n\nThese issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data; CWE-409) on the client side.\n\n\n### Affected usages\n\nApplications and libraries using urllib3 versions earlier than 2.7.0 may be affected when streaming compressed responses from untrusted sources in either of these cases, unless decompression is explicitly disabled:\n\n1. A response encoded with `br` is read incrementally with at least two `HTTPResponse.read(amt=N)` or `HTTPResponse.stream(amt=N)` calls while using the official [Brotli](https://pypi.org/project/brotli/) library.\n2. `HTTPResponse.drain_conn()` is called after response decompression has already started.\n\n\n### Remediation\n\nUpgrade to at least urllib3 version 2.7.0 in which the library:\n1. Is more efficient for reads with Brotli.\n2. Always skips decompression for `HTTPResponse.drain_conn()`.\n\nIf upgrading is not immediately possible, the following workarounds may reduce exposure in specific cases:\n1. For the Brotli-specific issue only, switch from [brotli](https://pypi.org/project/brotli/) to [brotlicffi](https://pypi.org/project/brotlicffi/) until you can upgrade urllib3; the official Brotli package is affected because of https://github.com/google/brotli/issues/1396.\n2. If your code explicitly calls `HTTPResponse.drain_conn()`, call `HTTPResponse.close()` instead when connection reuse is not important.\n\n\n### Credits\n\nThe Brotli-specific issue was reported by @kimkou2024.\n`HTTPResponse.drain_conn()` inefficiency was reported by @Cycloctane.",
"id": "GHSA-mf9v-mfxr-j63j",
"modified": "2026-06-08T19:52:23Z",
"published": "2026-05-11T14:51:45Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-mf9v-mfxr-j63j"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44432"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2026-142.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
"type": "CVSS_V4"
}
],
"summary": "urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API"
}
GHSA-QCCP-GFCP-XXVC
Vulnerability from github – Published: 2026-05-11 14:51 – Updated: 2026-05-14 20:35
VLAI?
Summary
urllib3: Sensitive headers forwarded across origins in proxied low-level redirects
Details
Impact
When following cross-origin redirects for requests made using urllib3’s high-level APIs, such as urllib3.request(), PoolManager.request(), and ProxyManager.request(), sensitive headers — Authorization, Cookie, and Proxy-Authorization (defined in Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT) — are stripped by default, as expected.
However, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers.
Affected usage
Applications and libraries using urllib3 versions earlier than 2.7.0 may be affected if they allow cross-origin redirects while making requests through HTTPConnection.urlopen() instances created via ProxyManager.connection_from_url().
Remediation
Upgrade to urllib3 version 2.7.0 or later, in which sensitive headers are stripped from redirects followed by HTTPConnection.
If upgrading is not immediately possible, avoid using this low-level redirect flow for cross-origin redirects. If appropriate for your use case, switch to ProxyManager.request().
Severity ?
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "urllib3"
},
"ranges": [
{
"events": [
{
"introduced": "1.23"
},
{
"fixed": "2.7.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-44431"
],
"database_specific": {
"cwe_ids": [
"CWE-200"
],
"github_reviewed": true,
"github_reviewed_at": "2026-05-11T14:51:20Z",
"nvd_published_at": "2026-05-13T16:16:57Z",
"severity": "HIGH"
},
"details": "### Impact\n\nWhen following cross-origin redirects for requests made using urllib3\u2019s high-level APIs, such as `urllib3.request()`, `PoolManager.request()`, and `ProxyManager.request()`, sensitive headers \u2014 `Authorization`, `Cookie`, and `Proxy-Authorization` (defined in `Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT`) \u2014 are stripped by default, as expected.\n\nHowever, cross-origin redirects followed from the low-level API via `ProxyManager.connection_from_url().urlopen(..., assert_same_host=False)` still forward these sensitive headers.\n\n### Affected usage\n\nApplications and libraries using urllib3 versions earlier than 2.7.0 may be affected if they allow cross-origin redirects while making requests through `HTTPConnection.urlopen()` instances created via `ProxyManager.connection_from_url()`.\n\n### Remediation\n\nUpgrade to urllib3 version 2.7.0 or later, in which sensitive headers are stripped from redirects followed by `HTTPConnection`.\n\nIf upgrading is not immediately possible, avoid using this low-level redirect flow for cross-origin redirects. If appropriate for your use case, switch to `ProxyManager.request()`.",
"id": "GHSA-qccp-gfcp-xxvc",
"modified": "2026-05-14T20:35:49Z",
"published": "2026-05-11T14:51:20Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44431"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "urllib3: Sensitive headers forwarded across origins in proxied low-level redirects"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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