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Vulnerability from cleanstart
Published
2026-05-18 13:41
Modified
2026-05-06 05:19
Summary
Security fixes for CVE-2025-58183, CVE-2025-58185, CVE-2025-58187, CVE-2025-58188, CVE-2025-58189, CVE-2025-61723, CVE-2025-61724, CVE-2025-61725, CVE-2025-61729, CVE-2026-32952, CVE-2026-39984, ghsa-pjcq-xvwq-hhpj, ghsa-xm5m-wgh2-rrg3 applied in versions: 1.15.2-r0, 1.16.0-r0, 1.18.0-r0
Details
Multiple security vulnerabilities affect the kyverno package. These issues are resolved in later releases. See references for individual vulnerability details.
{
"affected": [
{
"package": {
"ecosystem": "CleanStart",
"name": "kyverno"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-r0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"credits": [],
"database_specific": {},
"details": "Multiple security vulnerabilities affect the kyverno package. These issues are resolved in later releases. See references for individual vulnerability details.",
"id": "CLEANSTART-2026-TX25294",
"modified": "2026-05-06T05:19:29Z",
"published": "2026-05-18T13:41:03.857465Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-TX25294.json"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-58183"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-58185"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-58187"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-58188"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-58189"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-61723"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-61724"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-61725"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-61729"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-32952"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-39984"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-pjcq-xvwq-hhpj"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-xm5m-wgh2-rrg3"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-58183"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-58185"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-58187"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-58188"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-58189"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61723"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61724"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61725"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61729"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32952"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39984"
}
],
"related": [],
"schema_version": "1.7.3",
"summary": "Security fixes for CVE-2025-58183, CVE-2025-58185, CVE-2025-58187, CVE-2025-58188, CVE-2025-58189, CVE-2025-61723, CVE-2025-61724, CVE-2025-61725, CVE-2025-61729, CVE-2026-32952, CVE-2026-39984, ghsa-pjcq-xvwq-hhpj, ghsa-xm5m-wgh2-rrg3 applied in versions: 1.15.2-r0, 1.16.0-r0, 1.18.0-r0",
"upstream": [
"CVE-2025-58183",
"CVE-2025-58185",
"CVE-2025-58187",
"CVE-2025-58188",
"CVE-2025-58189",
"CVE-2025-61723",
"CVE-2025-61724",
"CVE-2025-61725",
"CVE-2025-61729",
"CVE-2026-32952",
"CVE-2026-39984",
"ghsa-pjcq-xvwq-hhpj",
"ghsa-xm5m-wgh2-rrg3"
]
}
CVE-2025-58183 (GCVE-0-2025-58183)
Vulnerability from cvelistv5 – Published: 2025-10-29 22:10 – Updated: 2025-11-04 21:13
VLAI?
EPSS
Title
Unbounded allocation when parsing GNU sparse map in archive/tar
Summary
tar.Reader does not set a maximum size on the number of sparse region data blocks in GNU tar pax 1.0 sparse files. A maliciously-crafted archive containing a large number of sparse regions can cause a Reader to read an unbounded amount of data from the archive into memory. When reading from a compressed source, a small compressed input can result in large allocations.
Severity ?
4.3 (Medium)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | archive/tar |
Affected:
0 , < 1.24.8
(semver)
Affected: 1.25.0 , < 1.25.2 (semver) |
Credits
Harshit Gupta (Mr HAX)
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CVE-2025-58185 (GCVE-0-2025-58185)
Vulnerability from cvelistv5 – Published: 2025-10-29 22:10 – Updated: 2025-11-04 21:13
VLAI?
EPSS
Title
Parsing DER payload can cause memory exhaustion in encoding/asn1
Summary
Parsing a maliciously crafted DER payload could allocate large amounts of memory, causing memory exhaustion.
Severity ?
5.3 (Medium)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | encoding/asn1 |
Affected:
0 , < 1.24.8
(semver)
Affected: 1.25.0 , < 1.25.2 (semver) |
Credits
Jakub Ciolek
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"collectionURL": "https://pkg.go.dev",
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"name": "UnmarshalWithParams"
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CVE-2025-61724 (GCVE-0-2025-61724)
Vulnerability from cvelistv5 – Published: 2025-10-29 22:10 – Updated: 2025-11-04 21:14
VLAI?
EPSS
Title
Excessive CPU consumption in Reader.ReadResponse in net/textproto
Summary
The Reader.ReadResponse function constructs a response string through repeated string concatenation of lines. When the number of lines in a response is large, this can cause excessive CPU consumption.
Severity ?
5.3 (Medium)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | net/textproto |
Affected:
0 , < 1.24.8
(semver)
Affected: 1.25.0 , < 1.25.2 (semver) |
Credits
Jakub Ciolek
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CVE-2025-58189 (GCVE-0-2025-58189)
Vulnerability from cvelistv5 – Published: 2025-10-29 22:10 – Updated: 2025-11-04 21:13
VLAI?
EPSS
Title
ALPN negotiation error contains attacker controlled information in crypto/tls
Summary
When Conn.Handshake fails during ALPN negotiation the error contains attacker controlled information (the ALPN protocols sent by the client) which is not escaped.
Severity ?
5.3 (Medium)
CWE
- CWE-117 - Improper Output Neutralization for Logs
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | crypto/tls |
Affected:
0 , < 1.24.8
(semver)
Affected: 1.25.0 , < 1.25.2 (semver) |
Credits
National Cyber Security Centre Finland
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"name": "negotiateALPN"
},
{
"name": "Conn.Handshake"
},
{
"name": "Conn.HandshakeContext"
},
{
"name": "Conn.Read"
},
{
"name": "Conn.Write"
},
{
"name": "Dial"
},
{
"name": "DialWithDialer"
},
{
"name": "Dialer.Dial"
},
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CVE-2025-61725 (GCVE-0-2025-61725)
Vulnerability from cvelistv5 – Published: 2025-10-29 22:10 – Updated: 2025-12-09 17:42
VLAI?
EPSS
Title
Excessive CPU consumption in ParseAddress in net/mail
Summary
The ParseAddress function constructs domain-literal address components through repeated string concatenation. When parsing large domain-literal components, this can cause excessive CPU consumption.
Severity ?
7.5 (High)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | net/mail |
Affected:
0 , < 1.24.8
(semver)
Affected: 1.25.0 , < 1.25.2 (semver) |
Credits
Philippe Antoine (Catena cyber)
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CVE-2025-61729 (GCVE-0-2025-61729)
Vulnerability from cvelistv5 – Published: 2025-12-02 18:54 – Updated: 2025-12-03 19:37
VLAI?
EPSS
Title
Excessive resource consumption when printing error string for host certificate validation in crypto/x509
Summary
Within HostnameError.Error(), when constructing an error string, there is no limit to the number of hosts that will be printed out. Furthermore, the error string is constructed by repeated string concatenation, leading to quadratic runtime. Therefore, a certificate provided by a malicious actor can result in excessive resource consumption.
Severity ?
7.5 (High)
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | crypto/x509 |
Affected:
0 , < 1.24.11
(semver)
Affected: 1.25.0 , < 1.25.5 (semver) |
Credits
Philippe Antoine (Catena cyber)
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CVE-2026-32952 (GCVE-0-2026-32952)
Vulnerability from cvelistv5 – Published: 2026-04-24 01:46 – Updated: 2026-04-24 16:29
VLAI?
EPSS
Title
go-ntlmssp NTLM challenges can panic on malformed payloads
Summary
go-ntlmssp is a Go package that provides NTLM/Negotiate authentication over HTTP. Prior to version 0.1.1, a malicious NTLM challenge message can causes an slice out of bounds panic, which can crash any Go process using `ntlmssp.Negotiator` as an HTTP transport. Version 0.1.1 patches the issue.
Severity ?
5.3 (Medium)
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Azure | go-ntlmssp |
Affected:
< 0.1.1
|
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CVE-2026-39984 (GCVE-0-2026-39984)
Vulnerability from cvelistv5 – Published: 2026-04-14 23:41 – Updated: 2026-04-16 14:00
VLAI?
EPSS
Title
Sigstore Timestamp Authority has Improper Certificate Validation in verifier
Summary
Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Versions 2.0.5 and below contain an authorization bypass vulnerability in the VerifyTimestampResponse function. VerifyTimestampResponse correctly verifies the certificate chain signature, but the TSA-specific constraint checks in VerifyLeafCert uses the first non-CA certificate from the PKCS#7 certificate bag instead of the leaf certificate from the verified chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key, causing the library to validate the signature against one certificate but perform authorization checks against another. This vulnerability only affects users of the timestamp-authority/v2/pkg/verification package and does not affect the timestamp-authority service itself or sigstore-go. The issue has been fixed in version 2.0.6.
Severity ?
5.5 (Medium)
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| sigstore | timestamp-authority |
Affected:
< 2.0.6
|
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CVE-2025-61723 (GCVE-0-2025-61723)
Vulnerability from cvelistv5 – Published: 2025-10-29 22:10 – Updated: 2025-11-04 21:14
VLAI?
EPSS
Title
Quadratic complexity when parsing some invalid inputs in encoding/pem
Summary
The processing time for parsing some invalid inputs scales non-linearly with respect to the size of the input. This affects programs which parse untrusted PEM inputs.
Severity ?
7.5 (High)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | encoding/pem |
Affected:
0 , < 1.24.8
(semver)
Affected: 1.25.0 , < 1.25.2 (semver) |
Credits
Jakub Ciolek
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"packageName": "encoding/pem",
"product": "encoding/pem",
"programRoutines": [
{
"name": "getLine"
},
{
"name": "Decode"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.24.8",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.25.2",
"status": "affected",
"version": "1.25.0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Jakub Ciolek"
}
],
"descriptions": [
{
"lang": "en",
"value": "The processing time for parsing some invalid inputs scales non-linearly with respect to the size of the input. This affects programs which parse untrusted PEM inputs."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-407: Inefficient Algorithmic Complexity",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-10-29T22:10:13.220Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/75676"
},
{
"url": "https://go.dev/cl/709858"
},
{
"url": "https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI"
},
{
"url": "https://pkg.go.dev/vuln/GO-2025-4009"
}
],
"title": "Quadratic complexity when parsing some invalid inputs in encoding/pem"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2025-61723",
"datePublished": "2025-10-29T22:10:13.220Z",
"dateReserved": "2025-09-30T15:05:03.604Z",
"dateUpdated": "2025-11-04T21:14:02.531Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2025-58188 (GCVE-0-2025-58188)
Vulnerability from cvelistv5 – Published: 2025-10-29 22:10 – Updated: 2025-11-04 21:13
VLAI?
EPSS
Title
Panic when validating certificates with DSA public keys in crypto/x509
Summary
Validating certificate chains which contain DSA public keys can cause programs to panic, due to a interface cast that assumes they implement the Equal method. This affects programs which validate arbitrary certificate chains.
Severity ?
7.5 (High)
CWE
- CWE-248 - Uncaught Exception
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | crypto/x509 |
Affected:
0 , < 1.24.8
(semver)
Affected: 1.25.0 , < 1.25.2 (semver) |
Credits
Jakub Ciolek
{
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"integrityImpact": "NONE",
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"title": "CISA ADP Vulnrichment"
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{
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"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "crypto/x509",
"product": "crypto/x509",
"programRoutines": [
{
"name": "alreadyInChain"
},
{
"name": "Certificate.Verify"
}
],
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"lessThan": "1.24.8",
"status": "affected",
"version": "0",
"versionType": "semver"
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"status": "affected",
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],
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"descriptions": [
{
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"lang": "en"
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{
"url": "https://go.dev/issue/75675"
},
{
"url": "https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI"
},
{
"url": "https://pkg.go.dev/vuln/GO-2025-4013"
}
],
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}
},
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},
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CVE-2025-58187 (GCVE-0-2025-58187)
Vulnerability from cvelistv5 – Published: 2025-10-29 22:10 – Updated: 2025-11-20 22:23
VLAI?
EPSS
Title
Quadratic complexity when checking name constraints in crypto/x509
Summary
Due to the design of the name constraint checking algorithm, the processing time of some inputs scale non-linearly with respect to the size of the certificate. This affects programs which validate arbitrary certificate chains.
Severity ?
7.5 (High)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | crypto/x509 |
Affected:
0 , < 1.24.9
(semver)
Affected: 1.25.0 , < 1.25.3 (semver) |
Credits
Jakub Ciolek
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
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"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2025-58187",
"options": [
{
"Exploitation": "none"
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{
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"timestamp": "2025-11-03T19:51:43.036632Z",
"version": "2.0.3"
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"dateUpdated": "2025-11-03T19:52:04.234Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
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"url": "http://www.openwall.com/lists/oss-security/2025/10/08/1"
}
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"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "crypto/x509",
"product": "crypto/x509",
"programRoutines": [
{
"name": "parseSANExtension"
},
{
"name": "domainToReverseLabels"
},
{
"name": "CertPool.AppendCertsFromPEM"
},
{
"name": "Certificate.CheckCRLSignature"
},
{
"name": "Certificate.CheckSignature"
},
{
"name": "Certificate.CheckSignatureFrom"
},
{
"name": "Certificate.CreateCRL"
},
{
"name": "Certificate.Verify"
},
{
"name": "CertificateRequest.CheckSignature"
},
{
"name": "CreateCertificate"
},
{
"name": "CreateCertificateRequest"
},
{
"name": "CreateRevocationList"
},
{
"name": "DecryptPEMBlock"
},
{
"name": "EncryptPEMBlock"
},
{
"name": "MarshalECPrivateKey"
},
{
"name": "MarshalPKCS1PrivateKey"
},
{
"name": "MarshalPKCS1PublicKey"
},
{
"name": "MarshalPKCS8PrivateKey"
},
{
"name": "MarshalPKIXPublicKey"
},
{
"name": "ParseCRL"
},
{
"name": "ParseCertificate"
},
{
"name": "ParseCertificateRequest"
},
{
"name": "ParseCertificates"
},
{
"name": "ParseDERCRL"
},
{
"name": "ParseECPrivateKey"
},
{
"name": "ParsePKCS1PrivateKey"
},
{
"name": "ParsePKCS1PublicKey"
},
{
"name": "ParsePKCS8PrivateKey"
},
{
"name": "ParsePKIXPublicKey"
},
{
"name": "ParseRevocationList"
},
{
"name": "RevocationList.CheckSignatureFrom"
},
{
"name": "SetFallbackRoots"
},
{
"name": "SystemCertPool"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.24.9",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
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"status": "affected",
"version": "1.25.0",
"versionType": "semver"
}
]
}
],
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"lang": "en",
"value": "Jakub Ciolek"
}
],
"descriptions": [
{
"lang": "en",
"value": "Due to the design of the name constraint checking algorithm, the processing time of some inputs scale non-linearly with respect to the size of the certificate. This affects programs which validate arbitrary certificate chains."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-407: Inefficient Algorithmic Complexity",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-11-20T22:23:47.179Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
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"url": "https://go.dev/issue/75681"
},
{
"url": "https://go.dev/cl/709854"
},
{
"url": "https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI"
},
{
"url": "https://pkg.go.dev/vuln/GO-2025-4007"
}
],
"title": "Quadratic complexity when checking name constraints in crypto/x509"
}
},
"cveMetadata": {
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"datePublished": "2025-10-29T22:10:12.624Z",
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GHSA-PJCQ-XVWQ-HHPJ
Vulnerability from github – Published: 2026-04-23 21:21 – Updated: 2026-04-27 16:35
VLAI?
Summary
go-ntlmssp NTLM challenges can panic on malformed payloads
Details
go-ntlmssp is a Go package that provides NTLM/Negotiate authentication over HTTP. Prior to version 0.1.1, a malicious NTLM challenge message can causes an slice out of bounds panic, which can crash any Go process using ntlmssp.Negotiator as an HTTP transport. Version 0.1.1 patches the issue.
Severity ?
5.3 (Medium)
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/Azure/go-ntlmssp"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.1.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-32952"
],
"database_specific": {
"cwe_ids": [
"CWE-190"
],
"github_reviewed": true,
"github_reviewed_at": "2026-04-23T21:21:58Z",
"nvd_published_at": "2026-04-24T03:16:07Z",
"severity": "MODERATE"
},
"details": "go-ntlmssp is a Go package that provides NTLM/Negotiate authentication over HTTP. Prior to version 0.1.1, a malicious NTLM challenge message can causes an slice out of bounds panic, which can crash any Go process using `ntlmssp.Negotiator` as an HTTP transport. Version 0.1.1 patches the issue.",
"id": "GHSA-pjcq-xvwq-hhpj",
"modified": "2026-04-27T16:35:38Z",
"published": "2026-04-23T21:21:58Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/Azure/go-ntlmssp/security/advisories/GHSA-pjcq-xvwq-hhpj"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32952"
},
{
"type": "PACKAGE",
"url": "https://github.com/Azure/go-ntlmssp"
},
{
"type": "WEB",
"url": "https://github.com/Azure/go-ntlmssp/releases/tag/v0.1.1"
}
],
"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:L",
"type": "CVSS_V3"
}
],
"summary": "go-ntlmssp NTLM challenges can panic on malformed payloads"
}
GHSA-XM5M-WGH2-RRG3
Vulnerability from github – Published: 2026-04-14 01:01 – Updated: 2026-04-24 20:43
VLAI?
Summary
Sigstore Timestamp Authority has Improper Certificate Validation in verifier
Details
Authorization bypass via certificate bag manipulation in sigstore/timestamp-authority verifier
An authorization bypass vulnerability exists in sigstore/timestamp-authority verifier (timestamp-authority/v2/pkg/verification): VerifyTimestampResponse function correctly verifies the certificate chain but when the TSA specific constraints are verified in VerifyLeafCert, the first non-CA certificate from the PKCS#7 certificate bag is used instead of the leaf certificate from the certificate chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key. The library validates the signature using the one certificate but performs authorization checks on the another, allowing an attacker to bypass some authorization controls.
This vulnerability does not apply to timestamp-authority service, only to users of timestamp-authority/v2/pkg/verification package.
This vulnerability does not apply to sigstore-go even though it is a user of timestamp-authority/v2/pkg/verification: Providing TSACertificate option to VerifyTimestampResponse fully mitigates the issue.
Patches
The issue will be fixed in timestamp-authority 2.0.6
Workarounds
Users of VerifyTimestampResponse can use the TSACertificate option to specify the exact certificate they expect to be used: this fully mitigates the issue.
References
This issue was found after reading CVE-2026-33753 / GHSA-3xxc-pwj6-jgrj (originally reported by @Jaynornj and @Pr00fOf3xpl0it)
Severity ?
5.5 (Medium)
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 2.0.5"
},
"package": {
"ecosystem": "Go",
"name": "github.com/sigstore/timestamp-authority/v2"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.0.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-39984"
],
"database_specific": {
"cwe_ids": [
"CWE-295"
],
"github_reviewed": true,
"github_reviewed_at": "2026-04-14T01:01:59Z",
"nvd_published_at": "2026-04-15T04:17:40Z",
"severity": "MODERATE"
},
"details": "### Authorization bypass via certificate bag manipulation in sigstore/timestamp-authority verifier\n\nAn authorization bypass vulnerability exists in sigstore/timestamp-authority verifier (timestamp-authority/v2/pkg/verification): `VerifyTimestampResponse` function correctly verifies the certificate chain but when the TSA specific constraints are verified in `VerifyLeafCert`, the first non-CA certificate from the PKCS#7 certificate bag is used instead of the leaf certificate from the certificate chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key. The library validates the signature using the one certificate but performs authorization checks on the another, allowing an attacker to bypass some authorization controls. \n\nThis vulnerability does **not** apply to timestamp-authority service, only to users of `timestamp-authority/v2/pkg/verification` package.\n\nThis vulnerability does **not** apply to sigstore-go even though it is a user of `timestamp-authority/v2/pkg/verification`: Providing `TSACertificate` option to `VerifyTimestampResponse` fully mitigates the issue.\n\n\n### Patches\n\nThe issue will be fixed in timestamp-authority 2.0.6\n\n### Workarounds\n\nUsers of `VerifyTimestampResponse` can use the `TSACertificate` option to specify the exact certificate they expect to be used: this fully mitigates the issue.\n\n### References\n\nThis issue was found after reading CVE-2026-33753 / GHSA-3xxc-pwj6-jgrj (originally reported by @Jaynornj and @Pr00fOf3xpl0it)",
"id": "GHSA-xm5m-wgh2-rrg3",
"modified": "2026-04-24T20:43:09Z",
"published": "2026-04-14T01:01:59Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/sigstore/timestamp-authority/security/advisories/GHSA-xm5m-wgh2-rrg3"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39984"
},
{
"type": "PACKAGE",
"url": "https://github.com/sigstore/timestamp-authority"
},
{
"type": "WEB",
"url": "https://github.com/sigstore/timestamp-authority/releases/tag/v2.0.6"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
}
],
"summary": "Sigstore Timestamp Authority has Improper Certificate Validation in verifier"
}
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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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