CVE-2026-56854
High · 7.5CVSS
7.5
EPSS
0.4%
Published
Aug 28, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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