VULNERABILITY INTELLIGENCE
CVE-2026-56854
CVSS score7.5 HIGH
EPSS probability0.44%
CISA KEVNot currently listed
Published2026-08-28
Last modified2026-09-03
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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.
Weakness classification
- 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-863