{"id":"CVE-2026-116696","aliases":[],"title":"russh's SSH agent server is susceptible to unbound allocations via repeated SSH_AGENT_CONSTRAIN_CONFIRM messages","titleSource":"GitHub_M","descriptionSource":"GitHub_M","products":[{"vendor":"Eugeny","name":"russh","platforms":[],"versions":[{"version":"< 0.65.0","status":"affected"}],"source":"GitHub_M","url":"https://www.cve.org/CVERecord?id=CVE-2026-116696"}],"remediation":[],"description":"russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.65.0, russh::keys::agent::server::serve in russh/src/keys/agent/server.rs accepts repeated SSH_AGENT_CONSTRAIN_CONFIRM records while adding a key and appends every Constraint::Confirm record to the key's retained constraint vector without a count or memory limit. A process that can connect to the agent socket, including the remote side of a forwarded agent session, can repeatedly add constrained keys and cause renewable memory growth that persists for the process lifetime because keys without a lifetime constraint do not expire. This issue is fixed in version 0.65.0.","severity":"low","score":3.3,"published":"2026-10-27T20:14:32.973Z","modified":"2026-10-27T20:14:32.973Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://github.com/Eugeny/russh/security/advisories/GHSA-9wfm-jcj8-jfv9","https://github.com/Eugeny/russh/commit/23aa5d28fe9601c5bdfe9e60b7ec5d4f882c3de6","https://github.com/Eugeny/russh/releases/tag/v0.65.0"],"sources":[{"name":"CVE","id":"CVE-2026-116696","modified":"2026-10-27T20:14:32.973Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-116696"}],"assessments":[{"source":"GitHub_M","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","score":3.3}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T19:30:46.166Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}