Bug 2525639 (CVE-2026-56854) - CVE-2026-56854 golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Authentication bypass due to unenforced source-address restrictions
Summary: CVE-2026-56854 golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Authenticati...
Keywords:
Status: NEW
Alias: CVE-2026-56854
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-28 15:33 UTC by OSIDB Bzimport
Modified: 2026-10-22 08:28 UTC (History)
109 users (show)

Fixed In Version:
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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:68333 0 None None None 2026-09-16 17:18:33 UTC

Description OSIDB Bzimport 2026-08-28 15:33:57 UTC 
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.
Comment 1 Jon Orris 2026-09-16 17:18:27 UTC 
This issue has been addressed in the following products:

  Cryostat 4 on RHEL 9

Via RHSA-2026:68333 https://access.redhat.com/errata/RHSA-2026:68333
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