{"cve":"CVE-2026-46705","nvd":{"published":"2026-06-10T22:17:00.713","modified":"2026-07-23T09:10:00.113","status":"Deferred","description":"Russh is a Rust SSH client & server library. From version 0.34.0-beta.1 to before version 0.61.0, the russh server authentication path keeps internal userauth state across SSH_MSG_USERAUTH_REQUEST messages without separating that state when the request principal changes. RFC 4252 allows the user name and service name fields to change between authentication requests. The issue is not that such changes are invalid. The issue is that russh-owned authentication state, such as remaining methods, partial-success state, and in-progress method state, can remain associated with the connection and then influence a later request for a different (user, service). This is an internal library state mismatch. This issue has been patched in version 0.61.0.","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:L/A:N","score":5.3},"cwes":["CWE-287"],"references":["https://github.com/Eugeny/russh/security/advisories/GHSA-hpv4-5h6f-wqr3","https://github.com/Eugeny/russh/security/advisories/GHSA-hpv4-5h6f-wqr3"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:38:48.522727527+00:00"},"epss":{"cve":"CVE-2026-46705","score":0.00218,"percentile":0.12332,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-hpv4-5h6f-wqr3","url":"https://osv.dev/vulnerability/GHSA-hpv4-5h6f-wqr3","summary":"russh server userauth state is not reset when authentication principal changes","modified":"2026-09-10T03:51:05.855394597Z","packages":[{"ecosystem":"crates.io","name":"russh","purl":"pkg:cargo/russh","ranges":[">=0.34.0-beta.1 <0.61.0"],"fixed":["0.61.0"]}]}],"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."]}