Improper Check for Certificate Revocation Affecting golang.org/x/crypto/ssh/knownhosts package, versions <0.52.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published22 May 2026
- disclosed22 May 2026
- creditUnknown
Introduced: 22 May 2026
CVE-2026-42508 (opens in a new tab)How to fix?
Upgrade golang.org/x/crypto/ssh/knownhosts to version 0.52.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Check for Certificate Revocation in the SignatureKey verification process. An attacker can bypass revocation enforcement by presenting a certificate with a revoked SignatureKey, potentially allowing unauthorized access or trust to be established.