Riskcovery

CVE-2026-42189

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

State
Published
Severity
7.5 High
Published
May 8, 2026
Updated
May 11, 2026
Reserved
Apr 25, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HGitHub_M

Weaknesses

  • CWE-770 Allocation of Resources Without Limits or Throttling
  • CWE-789 Memory Allocation with Excessive Size Value

Affected Products

ProductVersions
russhEugeny
  • < 0.60.1Affected

References

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