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CVE-2026-42508 — Vulnerability in golang.org/x/crypto — CVE Details

CRITICAL

golang.org/x/crypto vulnerable to auth bypass via unenforced @revoked status

Published June 25, 2026Updated September 10, 2026Source: osv

Summary

Previously, a revoked 'SignatureKey' belonging to a CA was not correctly checked for revocation. Now, both the 'key' and 'key.SignatureKey' are checked for @revoked.

Advisory Timeline

  • First published June 25, 2026 (109 days ago).
  • Last revised September 10, 2026 — 76 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update golang.org/x/crypto to 0.52.0 or later
go get golang.org/x/crypto@v0.52.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: go (1).

PackageEcosystemAffectedFixed In
golang.org/x/crypto
go
All versions0.52.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-295
    Improper Certificate ValidationMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.1 score means for each attack dimension.

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

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

References

Frequently Asked Questions

What is CVE-2026-42508?
golang.org/x/crypto vulnerable to auth bypass via unenforced @revoked status This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.1/10).
How do I check if my project is affected by CVE-2026-42508?
CVE-2026-42508 affects golang.org/x/crypto. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-42508 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.1

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-5cgq-3rg8-m6cv
GO-2026-5021

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