{"id":"CVE-2026-42189","aliases":["GHSA-f5v4-2wr6-hqmg"],"url":"https://o3.security/vulnerability/CVE-2026-42189","summary":"Russh: Pre-auth DoS via unbounded allocation in keyboard-interactive auth","details":"Russh is a Rust SSH client & server library. Prior to version 0.60.1, a pre-authentication denial-of-service vulnerability exists in the server's keyboard-interactive authentication handler. A malicious client can crash any russh-based server that implements keyboard-interactive auth (e.g., for 2FA/TOTP) with a single malformed packet, requiring no credentials. This issue has been patched in version 0.60.1.","published":"2026-05-08T19:49:51.179Z","modified":"2026-08-07T11:51:05.381065578Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"russh","fixedVersion":"0.60.1"}],"fix":{"url":"https://github.com/Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1","label":"Eugeny/russh@6c3c80a"},"references":[{"type":"WEB","url":"https://github.com/Eugeny/russh/releases/tag/v0.60.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42189.json"},{"type":"ADVISORY","url":"https://github.com/Eugeny/russh/security/advisories/GHSA-f5v4-2wr6-hqmg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42189"},{"type":"FIX","url":"https://github.com/Eugeny/russh/commit/6c3c80a9b6d60763d6227d60fa8310e57172a4d1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:05.381065578Z"}}