CVE-2026-102824

CVE-2026-102824 · Russh: Missing X25519 zero-point validation in hybrid ML-KEM key exchange

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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 4.3 · Moyenne · EPSS 0,1% · Correctif disponible

Publication

2026-09-29T18:27:41.650Z

Mise à jour

2026-09-30T20:24:58.381Z

Pile logicielle: system

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