{"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","CWE-358"],"vendor":"Eugeny","product":"russh","affected":["russh < 0.63.0"],"published":"2026-09-29","updated":"2026-09-30","sourceUpdated":"2026-09-30T21:17:05.920","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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102824.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-102824"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543498"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-102824"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102824"},{"url":"https://github.com/advisories/GHSA-w3jg-pjxf-73p4"},{"url":"https://github.com/Eugeny/russh"},{"url":"https://access.redhat.com/errata/RHSA-2026:74586"}],"tags":["nvd","cve.org","csaf","vex","red-hat","ghsa","rust","osv"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-30T20:24:54.936526Z"},"epss":0.00141,"epssPercentile":0.03426,"ingestedAt":"2026-09-29T18:42:35.834Z","aliases":["GHSA-w3jg-pjxf-73p4"],"ecosystem":"rust","patched":["russh 0.63.0"],"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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102824.json)\n- **RHSA-2026:74586** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:74586)\n\n## Package advisory (CVE-2026-102824)\n\nAffected packages:\n\n- `russh < 0.63.0`\n\nPatched in:\n\n- `russh 0.63.0`\n\nSource: https://github.com/advisories/GHSA-w3jg-pjxf-73p4","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}