VULNERABILITY INTELLIGENCE

CVE-2026-42189

CVSS score7.5 HIGH

EPSS probability0.48%

CISA KEVNot currently listed

Published2026-05-08

Last modified2026-10-26

Description

Russh is a Rust SSH client & server library. Prior to version 0.60.1, a pre-authentication denial-of-service vulnerability exists in the server's keyboard-interactive authentication handler. A malicious client can crash any russh-based server that implements keyboard-interactive auth (e.g., for 2FA/TOTP) with a single malformed packet, requiring no credentials. This issue has been patched in version 0.60.1.