CVE-2026-46595

A flaw was found in golang.org/x/crypto/ssh. Source-address validation can be skipped when an SSH server configuration uses an authentication callback type other than public key, allowing authorization bypass in misconfigured servers. This is a follow-on to incomplete coverage from the CVE-2024-45337 fix.

golang.org/x/crypto/ssh is vulnerable to authorization bypass when SSH server configurations rely on source-address validation alongside non-public-key authentication callbacks. An attacker with low privileges who can authenticate through such a callback path may bypass intended source-address restrictions and gain unauthorized SSH access. Red Hat impact sits in services built with affected x/crypto/ssh, including RHEL golang streams, hummingbird Go toolchains, RHACM/MCE agents, and OpenShift or Ceph components that embed Go SSH servers with mixed callback types.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.