CVE-2026-67279 SSH Pre-Authentication Rekey State Bypass in MikroTik RouterOS

RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was never attempted, allowing an unauthenticated client to open a session channel and send an exec request. On affected builds the server dispatches the command, enabling unauthenticated...

CVE-2026-67279

The MikroTik RouterOS SSH server is vulnerable to an authentication bypass (CVE-2026-67279) where a client-requested rekey before authentication triggers the server to enter the connection protocol without verifying user credentials. This allows unauthenticated clients to open session channels an...