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golang.org/x/crypto CVE-2026-42508

| EUVD-2026-31399 CRITICAL
Improper Certificate Validation (CWE-295)
2026-05-22 Go
Information Disclosure Golang Org X Crypto Ssh Knownhosts
9.1
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

4
Analysis Generated
May 28, 2026 - 15:08 vuln.today
CVSS changed
May 28, 2026 - 15:07 NVD
9.1 (None) 9.1 (CRITICAL)
Patch available
May 22, 2026 - 04:31 EUVD
CVE Published
May 22, 2026 - 02:31 nvd
UNKNOWN (no severity yet)

DescriptionNVD

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.

AnalysisAI

Improper certificate revocation validation in the golang.org/x/crypto/ssh/knownhosts package allows SSH connections to succeed against hosts whose CA SignatureKey has been revoked. Versions prior to 0.52.0 only validated the leaf 'key' against revocation entries while ignoring 'key.SignatureKey', enabling attackers holding a revoked CA-signed host key to impersonate trusted servers. …

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RemediationAI

Within 24 hours: Identify all applications and services using golang.org/x/crypto and document their current versions. Within 7 days: Update golang.org/x/crypto to version 0.52.0 or later in development and staging environments; test certificate revocation functionality. …

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CVE-2026-42508 vulnerability details – vuln.today
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