{"id":"CVE-2026-73429","title":"Russh is a Rust SSH client & server library","summary":"Russh is a Rust SSH client & server library. Prior to 0.62.4, a malicious SSH server can crash a russh client session with a malformed KEX_ECDH_REPLY containing a server ephemeral value that is not 32 bytes long. The client-side Curve255…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-704","CWE-754"],"vendor":"russh","product":"russh","affected":["russh < 0.62.4"],"patched":["russh 0.62.4"],"published":"2026-08-12","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:02:22.660","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73429","references":[{"url":"https://github.com/Eugeny/russh/commit/a7fc1eb5717264e31c3c5f7dd849b73989a08f3d","label":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/releases/tag/v0.62.4","label":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-g9hv-x236-4qp3","label":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-g9hv-x236-4qp3","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/Eugeny/russh"}],"tags":["nvd","osv","rust"],"epss":0.00354,"epssPercentile":0.29155,"aliases":["GHSA-g9hv-x236-4qp3"],"ecosystem":"rust","ingestedAt":"2026-08-13T19:18:22.091Z","slug":"CVE-2026-73429","body":"## Overview\n\nRussh is a Rust SSH client & server library. Prior to 0.62.4, a malicious SSH server can crash a russh client session with a malformed KEX_ECDH_REPLY containing a server ephemeral value that is not 32 bytes long. The client-side Curve25519Kex::compute_shared_secret function in russh/src/kex/curve25519.rs passes the decoded exchange.server_ephemeral value to clone_from_slice without validating its length, causing a deterministic panic before the server host key is verified. The panic terminates the spawned client session task and surfaces as a JoinError, while the embedding process normally remains running. This issue is fixed in version 0.62.4.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-73429)\n\nAffected packages:\n\n- `russh < 0.62.4`\n\nPatched in:\n\n- `russh 0.62.4`\n\nSource: https://osv.dev/vulnerability/GHSA-g9hv-x236-4qp3","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}