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Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
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.
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{
"vendor": "Eugeny",
"product": "russh",
"versions": [
{
"version": "< 0.63.0",
"status": "affected"
}
]
}Original source record · Cite this exact observation · Complete original publisher JSON