CVE-2026-42508

CRITICAL 9.1

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

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

4th

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.

Vendor	golang.org/x/crypto
Product	golang.org/x/crypto/ssh/knownhosts
Published	May 22, 2026
Last Updated	May 22, 2026

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Affected Versions

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

0 < 0.52.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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