CVE-2026-42189: Russh Project Russh

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Russh Project Russh: before 0.60.1 (fixed in 0.60.1)
• Warpgate Project Warpgate: before 0.23.1 (fixed in 0.23.1)

Published 2026-05-08. Last modified 2026-06-17.