CVE-2026-56854

UNKNOWN 0.0

Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.

Vendor	golang.org/x/crypto
Product	golang.org/x/crypto/ssh
Published	Aug 28, 2026

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Affected Versions

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

0 < 0.55.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/issue/80213 go.dev: https://go.dev/cl/797040 pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-6303

Credits

Longwei Wang (@gn00295120)