{"id":"CVE-2026-116774","revision":"474fe004bcf0471e93b8cc511e2e1543","records":[{"revision":"474fe004bcf0471e93b8cc511e2e1543","observedAt":"2026-10-30T23:47:40.018+00:00","statement":{"source":"nvd","id":"CVE-2026-116774","aliases":[],"title":"russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From 0.60.0 until 0.65.0, channel-open parsing accepts a peer-declared maximum_packet_size of zero and passes it into ChannelTx::poll_writable…","description":"russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. From 0.60.0 until 0.65.0, channel-open parsing accepts a peer-declared maximum_packet_size of zero and passes it into ChannelTx::poll_writable in russh/src/channels/io/tx.rs. The Channel::data, Channel::make_writer, and Channel::into_stream asynchronous write paths then calculate a writable size of zero and remain pending forever because window adjustments cannot satisfy a static zero packet maximum. An authenticated client can strand server writes, and a malicious server can strand client writes, allowing affected tasks, channels, and connections to accumulate without surfacing an error. This issue is fixed in version 0.65.0.","state":0,"publishedAt":"2026-10-27T21:18:05.933+00:00","modifiedAt":"2026-10-28T17:18:06.99+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/Eugeny/russh/commit/39cb9dbaa37caf555d34c6c22efa3bbbff9e186c","https://github.com/Eugeny/russh/releases/tag/v0.65.0","https://github.com/Eugeny/russh/security/advisories/GHSA-fw5c-8223-6h42"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-116774","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-400","CWE-835"],"productCriteria":[],"sourceDates":{"published":"2026-10-27T21:18:05.933","lastModified":"2026-10-28T17:18:06.990"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-116774","identifiers":["CVE-2026-116774"]},"retained":false,"historicalAffected":[]}],"coverage":[]}