CVE-2026-102824 | BDVDB-2026-381007 Detail

Description#

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.

Impact#

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Exploit#

History#

1. Version 12026-09-29Record published in the CVE List.
2. Version 22026-09-30Most recent update recorded in the CVE List.