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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-42189

Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Eugeny russh

  • < 0.60.1affected

References