CVE-2026-102824: CWE-327: Use of a Broken or Risky Cryptographic Algorithm in Eugeny russh
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.
CVE-2026-102824: CWE-327: Use of a Broken or Risky Cryptographic Algorithm in Eugeny russh
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.
CVSS v3.1
Score 4.3medium
Affected software
Eugeny
russh
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-29T17:25:25.265Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abc0552680226ef681dfaf5
Added to database: 09/29/2026, 18:37:06 UTC
Last updated: 09/29/2026, 18:37:06 UTC
Views: 1
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