{"id":"CVE-2026-73430","revision":"d3af9f19a0a04716b1ccd36ba2710ad8","records":[{"revision":"d3af9f19a0a04716b1ccd36ba2710ad8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-73430","aliases":[],"title":"Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)","description":"Russh is a Rust SSH client & server library. Prior to 0.62.4, an unauthenticated SSH client can cause a denial of service by sending SSH_MSG_KEX_ECDH_INIT with a 32-byte all-zero Q_C value. Curve25519Kex::server_dh in russh/src/kex/curve25519.rs accepts the all-zero peer public value and computes an all-zero shared secret, after which compute_exchange_hash calls encode_mpint in russh/src/kex/mod.rs and indexes beyond the end of the input while skipping leading zero bytes. The resulting panic occurs before authentication and terminates the server key-exchange task. This issue is fixed in version 0.62.4.","state":0,"publishedAt":"2026-08-12T20:55:38.202+00:00","modifiedAt":"2026-08-13T17:53:22.532+00:00","affected":[{"ecosystem":"Vendor product","name":"russh","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Eugeny\",\n                    \"product\": \"russh\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.62.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/Eugeny/russh/security/advisories/GHSA-5xvq-cp9x-6p6r","https://github.com/Eugeny/russh/commit/a7fc1eb5717264e31c3c5f7dd849b73989a08f3d","https://github.com/Eugeny/russh/releases/tag/v0.62.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-73430","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-73430","identifiers":["CVE-2026-73430"]},"retained":false,"historicalAffected":[]}],"coverage":[]}