CVE-2026-42189 — Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth
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 authentica…
Published: 2026-05-08 · CVSS: 7.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7