| id: GO-2026-6303 |
| modules: |
| - module: golang.org/x/crypto |
| versions: |
| - fixed: 0.55.0 |
| vulnerable_at: 0.54.0 |
| packages: |
| - package: golang.org/x/crypto/ssh |
| symbols: |
| - connection.serverAuthenticate |
| derived_symbols: |
| - NewServerConn |
| summary: Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh |
| description: | |
| 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. |
| credits: |
| - Longwei Wang (@gn00295120) |
| references: |
| - report: https://go.dev/issue/80213 |
| - fix: https://go.dev/cl/797040 |
| cve_metadata: |
| id: CVE-2026-56854 |
| cwe: 'CWE-863: Incorrect Authorization' |
| source: |
| id: go-security-team |
| review_status: REVIEWED |
