{"id":"CVE-2026-56854","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-56854","summary":"Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh","details":"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.","published":"2026-08-28T14:47:45Z","modified":"2026-08-28T15:15:16.725706233Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Go","name":"golang.org/x/crypto","fixedVersion":"0.55.0"}],"fix":null,"references":[{"type":"REPORT","url":"https://go.dev/issue/80213"},{"type":"FIX","url":"https://go.dev/cl/797040"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-28T15:15:16.725706233Z"}}