CVE-2026-42189
CVE-2026-42189 · Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 7.5 · High · EPSS 0.5% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
russh
- Versions
- < 0.60.1: Affected
No fix published
rust-russh Debian:14
- Versions
- 0.57.1-1
- 0.57.1-2
- Affected ranges
- ECOSYSTEM: < 0.64.1-1
Update to 0.64.1-1
rust-russh Ubuntu:26.10
- Versions
- 0.57.1-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published