Cyberattackers have begun targeting a critical authentication bypass in OpenSSH, identified as CVE-2026-123158, within hours of the vulnerability’s public disclosure. The flaw, dubbed “SSHole,” has already been used to gain root access to at least one Alpine Linux honeypot, confirming the bug is being actively exploited in the wild.
The vulnerability affects Linux systems using the musl C library, including Alpine Linux and OpenWrt, in configurations where password authentication is enabled but the Pluggable Authentication Module (PAM) is disabled. Attackers can bypass security by providing any password between 257 and 1,024 bytes, which allows access to accounts that should require specific credentials. OpenSSH released version 10.6p2 to mitigate the risk, and Alpine Linux has pushed an updated openssh-server package, though administrators must restart the SSH daemon to apply the fix.
