{"id":"CVE-2026-116773","sourceIdentifier":"security-advisories@github.com","published":"2026-10-27T21:18:05.780","lastModified":"2026-10-30T16:17:41.327","vulnStatus":"Deferred","cveTags":[],"descriptions":[{"lang":"en","value":"russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.65.0, the client Session::process_packet path in russh/src/client/encrypted.rs accepts repeated packets encoded with russh's private msg::EXT_INFO = 7 before authentication, while the standards-compliant EXT_INFO message number 82 does not reach the affected handler. The handle_ext_info function appends every parsed extension name to received_extensions without clearing, deduplicating, or bounding the vector. A malicious SSH server that deliberately sends private message number 7 can therefore retain an unbounded number of attacker-controlled extension names for the session lifetime, causing progressive client memory exhaustion. This issue is fixed in version 0.65.0."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"Eugeny","product":"russh","versions":[{"version":"< 0.65.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","baseScore":4.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":2.8,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-30T15:17:39.066575Z","id":"CVE-2026-116773","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-770"}]}],"references":[{"url":"https://github.com/Eugeny/russh/commit/b33e93beec393e6d29eee69c1b8831736724ee75","source":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/releases/tag/v0.65.0","source":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-4p9f-7p9m-5vfg","source":"security-advisories@github.com"},{"url":"https://github.com/Eugeny/russh/security/advisories/GHSA-4p9f-7p9m-5vfg","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}