Distrust compromised intermediate certificates in crypto/x509

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-111943
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-21 01:17:20 UTC
Updated2026-10-30 13:18:28 UTC
DescriptionOn most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action. To defend against the narrower set of cases that may remain affected, a denylist was added in crypto/x509 to return an error when calling Verify with any of the known intermediate certificates that are no longer considered to be trustworthy.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from ADP

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS: 0.003960000 probability, percentile 0.337930000 (date 2026-11-01)

Problem Types: CWE-299 | CWE-299: Improper Check for Certificate Revocation | CWE-299 CWE-299 Improper Check for Certificate Revocation

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Crypto/x509 affected 1.26.10 semver Not specified
CNA Go Standard Library Crypto/x509 affected 1.27.0-0 1.27.3 semver Not specified

References

ReferenceSourceLinkTags
pkg.go.dev/vuln/GO-2026-6809 [email protected] pkg.go.dev
groups.google.com/g/golang-announce/c/66pojueaQek [email protected] groups.google.com
www.openwall.com/lists/oss-security/2026/10/20/29 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
go.dev/issue/82345 [email protected] go.dev
go.dev/cl/851047 [email protected] go.dev
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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