CVE-2026-56854 — Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh

Affected: golang.org/x/crypto/ssh

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.

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CVE-2026-56854 — Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh