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,…
Exact source revision recorded 11 Nov 2026 05:29:30 UTC. It does not establish the source's current position. Latest evidence.
euvd · EUVD-2026-89207
PublishedRussh 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.
EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.
Original publisher date fields
datePublished: Sep 29, 2026, 6:27:41 PM
dateUpdated: Sep 30, 2026, 8:24:58 PM
1 related source bulletins · separate from aliases
RHSA-2026:74586: Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
CVE-2026-102821 · CVE-2026-102823 · CVE-2026-102824 · CVE-2026-102825
- Source published
- Sep 29, 2026, 6:27:41 PM (timezone not stated)
- Source modified
- Sep 30, 2026, 8:24:58 PM (timezone not stated)
- Observed here
- 11 Nov 2026 05:29:30 UTC
- Source terms
- ENISA EUVD · source terms and attribution apply
Original source record · Cite this exact observation · Complete original publisher JSON
This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.
EUVD CVSS 3.1 · 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N