{"id":"CVE-2026-102824","title":"Russh is a Rust SSH client and server library","summary":"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_secr…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","cwe":["CWE-327"],"vendor":"Eugeny","product":"russh","affected":["russh < 0.63.0"],"published":"2026-09-29","updated":"2026-09-29","sourceUpdated":"2026-09-29T19:17:24.673","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-102824","references":[{"url":"https://github.com/Eugeny/russh/commit/8da8967f196472576b1565d518a0ed60fce60f0c","label":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/releases/tag/v0.63.0","label":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-w3jg-pjxf-73p4","label":"security-advisories@github.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-29T18:42:35.834Z","slug":"CVE-2026-102824","body":"## Overview\n\nRussh 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}