CVE-2026-42508

Invoking auth bypass via unenforced @revoked status in golang.org/x/crypto/ssh/knownhosts

CVSS 9.1 CRITICALEPSS 0.4%

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.1EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

22 May 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

golang.org/x/crypto · golang.org/x/crypto/ssh/knownhosts

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References

https://go.dev/cl/781220 https://go.dev/issue/79568 https://groups.google.com/g/golang-announce/c/a082jnz-LvI https://pkg.go.dev/vuln/GO-2026-5021