Use of a Broken or Risky Cryptographic Algorithm Affecting rust-russh package, versions <0.64.1-1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.14% (3rd percentile)

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  • Snyk IDSNYK-DEBIAN14-RUSTRUSSH-20941763
  • published15 Oct 2026
  • disclosed29 Sept 2026

Introduced: 29 Sep 2026

NewCVE-2026-102824  (opens in a new tab)
CWE-327  (opens in a new tab)

How to fix?

Upgrade Debian:14 rust-russh to version 0.64.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rust-russh package and not the rust-russh package as distributed by Debian. See How to fix? for Debian:14 relevant fixed versions and status.

Russh is a Rust SSH client and server library. Prior to 0.63.0, the hybrid ML-KEM 768 and X25519 implementation in russh/src/kex/hybrid_mlkem.rs accepts an all-zero 32-byte peer X25519 public key in both server_dh and compute_shared_secret, forcing the X25519 contribution to the combined shared secret to zero. A malicious SSH peer can therefore make the combined secret depend only on ML-KEM, defeating the hybrid exchange's intended fallback protection if ML-KEM is later weakened. This issue is fixed in version 0.63.0.

CVSS Base Scores

version 3.1