CVE-2026-56854 — Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh

Description (CNA)

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 (CNA)

Vendor / product	Versions
golang.org/x/crypto / golang.org/x/crypto/ssh	affected 0 before 0.55.0

CWE

No CWE identifiers supplied.

References

https://go.dev/issue/80213
https://go.dev/cl/797040
https://pkg.go.dev/vuln/GO-2026-6303

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.