FKIE_CVE-2026-21441
Vulnerability from fkie_nvd - Published: 2026-01-07 22:15 - Updated: 2026-07-03 13:16
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
urllib3 is an HTTP client library for Python. 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 decoding or decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client. Applications and libraries are affected when they stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable redirects by setting `redirect=False` for requests to untrusted source.
References
{
"affected": [
{
"affectedData": [
{
"product": "urllib3",
"vendor": "urllib3",
"versions": [
{
"status": "affected",
"version": "\u003e= 1.22, \u003c 2.6.3"
}
]
}
],
"source": "security-advisories@github.com"
},
{
"affectedData": [
{
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"cpe:/o:redhat:enterprise_linux:7::server"
],
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"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/o:redhat:enterprise_linux:7::server"
],
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"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openstack:17.1",
"cpe:/a:redhat:openstack:17.1::el8"
],
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"product": "Red Hat OpenStack Platform 17.1",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:rhui:4::el8"
],
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"product": "RHUI 4 for RHEL 8",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:satellite:6.16::el8",
"cpe:/a:redhat:satellite_capsule:6.16::el8",
"cpe:/a:redhat:satellite_utils:6.16::el8"
],
"defaultStatus": "affected",
"product": "Red Hat Satellite 6.16 for RHEL 8",
"vendor": "Red Hat"
},
{
"cpes": [
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"cpe:/a:redhat:satellite_utils:6.16::el9"
],
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"vendor": "Red Hat"
},
{
"cpes": [
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"cpe:/a:redhat:satellite_capsule:6.17::el9",
"cpe:/a:redhat:satellite_utils:6.17::el9"
],
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"vendor": "Red Hat"
},
{
"cpes": [
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"cpe:/a:redhat:satellite_capsule:6.18::el9",
"cpe:/a:redhat:satellite_maintenance:6.18::el9",
"cpe:/a:redhat:satellite_utils:6.18::el9"
],
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},
{
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},
{
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},
{
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{
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},
{
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},
{
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{
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},
{
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},
{
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{
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},
{
"cpes": [
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],
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},
{
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],
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},
{
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],
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},
{
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},
{
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},
{
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],
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},
{
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{
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{
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{
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],
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},
{
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},
{
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"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
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},
{
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},
{
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},
{
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],
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},
{
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{
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{
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{
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},
{
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},
{
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},
{
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},
{
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],
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},
{
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
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],
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},
{
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],
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},
{
"cpes": [
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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},
{
"cpes": [
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],
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},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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},
{
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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},
{
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],
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},
{
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],
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{
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},
{
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},
{
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},
{
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],
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},
{
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],
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"vendor": "Red Hat"
},
{
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],
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},
{
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],
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"vendor": "Red Hat"
},
{
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],
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"product": "Red Hat Enterprise Linux Resilient Storage EUS (v.9.4)",
"vendor": "Red Hat"
},
{
"cpes": [
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],
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"product": "Zero Trust Workload Identity Manager 1",
"vendor": "Red Hat"
},
{
"cpes": [
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],
"defaultStatus": "affected",
"product": "cert-manager operator for Red Hat OpenShift 1.18",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:mirror_registry:2.0::el8"
],
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"product": "mirror registry for Red Hat OpenShift 2.0",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:external_secrets_operator:1"
],
"defaultStatus": "affected",
"product": "External Secrets Operator for Red Hat OpenShift",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:logging:5"
],
"defaultStatus": "affected",
"product": "Logging Subsystem for Red Hat OpenShift",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:rhmt:1"
],
"defaultStatus": "affected",
"product": "Migration Toolkit for Containers",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:migration_toolkit_virtualization:2"
],
"defaultStatus": "affected",
"product": "Migration Toolkit for Virtualization",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:multiarch_tuning_operator"
],
"defaultStatus": "affected",
"product": "Multiarch Tuning Operator",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:multicluster_engine"
],
"defaultStatus": "affected",
"product": "Multicluster Engine for Kubernetes",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:ocp_tools"
],
"defaultStatus": "affected",
"product": "OpenShift Developer Tools and Services",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openshift_lightspeed"
],
"defaultStatus": "affected",
"product": "OpenShift Lightspeed",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:openshift_pipelines:1"
],
"defaultStatus": "affected",
"product": "OpenShift Pipelines",
"vendor": "Red Hat"
},
{
"cpes": [
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],
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"vendor": "Red Hat"
},
{
"cpes": [
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],
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"product": "Red Hat AI Inference Server",
"vendor": "Red Hat"
},
{
"cpes": [
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],
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"value": "urllib3 is an HTTP client library for Python. urllib3\u0027s 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 decoding or decompression based on the HTTP `Content-Encoding` header (e.g., `gzip`, `deflate`, `br`, or `zstd`). When using the streaming API, the library decompresses only the necessary bytes, enabling partial content consumption. Starting in version 1.22 and prior to version 2.6.3, for HTTP redirect responses, the library would read the entire response body to drain the connection and decompress the content unnecessarily. This decompression occurred even before any read methods were called, and configured read limits did not restrict the amount of decompressed data. As a result, there was no safeguard against decompression bombs. A malicious server could exploit this to trigger excessive resource consumption on the client. Applications and libraries are affected when they stream content from untrusted sources by setting `preload_content=False` when they do not disable redirects. Users should upgrade to at least urllib3 v2.6.3, in which the library does not decode content of redirect responses when `preload_content=False`. If upgrading is not immediately possible, disable redirects by setting `redirect=False` for requests to untrusted source."
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}
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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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