CVE-2026-102824Russh: Missing X25519 zero-point validation in hybrid ML-KEM key exchange
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- Weakness (CWE)
- CWE-327
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 30, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Eugeny russh eugeny:russh (from the name) | before 0.63.0 | CNA record |
References
- https://github.com/Eugeny/russh/security/advisories/GHSA-w3jg-pjxf-73p4x-refsource-confirm
- https://github.com/Eugeny/russh/commit/8da8967f196472576b1565d518a0ed60fce60f0cx-refsource-misc
- https://github.com/Eugeny/russh/releases/tag/v0.63.0x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.