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.
History

Sat, 29 Aug 2026 00:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Sat, 29 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-346
References
Metrics threat_severity

None

threat_severity

Critical


Fri, 28 Aug 2026 22:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-863
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 28 Aug 2026 21:00:00 +0000

Type Values Removed Values Added
First Time appeared Golang
Golang crypto
Vendors & Products Golang
Golang crypto

Fri, 28 Aug 2026 17:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Fri, 28 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-08-28T20:17:17.397Z

Reserved: 2026-06-23T15:10:49.353Z

Link: CVE-2026-56854

cve-icon Vulnrichment

Updated: 2026-08-28T20:16:30.024Z

cve-icon NVD

Status : Received

Published: 2026-08-28T16:18:17.607

Modified: 2026-08-28T22:16:52.220

Link: CVE-2026-56854

cve-icon Redhat

Severity : Critical

Publid Date: 2026-08-28T15:14:26Z

Links: CVE-2026-56854 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-29T01:30:05Z