{"cve":"CVE-2026-73430","nvd":{"published":"2026-08-12T21:17:41.883","modified":"2026-10-24T15:10:00.190","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-754"],"references":["https://github.com/Eugeny/russh/commit/a7fc1eb5717264e31c3c5f7dd849b73989a08f3d","https://github.com/Eugeny/russh/releases/tag/v0.62.4","https://github.com/Eugeny/russh/security/advisories/GHSA-5xvq-cp9x-6p6r"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-73430","score":0.00597,"percentile":0.48262,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-5xvq-cp9x-6p6r","url":"https://osv.dev/vulnerability/GHSA-5xvq-cp9x-6p6r","summary":"Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)","modified":"2026-09-10T03:51:10.498100204Z","packages":[{"ecosystem":"crates.io","name":"russh","purl":"pkg:cargo/russh","ranges":["<0.62.4"],"fixed":["0.62.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}