{"schemaVersion":3,"id":"RUSTSEC-2026-0340","aliases":["GHSA-3g6h-r5qx-f6hq"],"status":"published","duplicateOf":null,"title":null,"description":"Peer minimum ACK delay can panic quinn-proto when ACK_FREQUENCY transmission is enabled\n\nWhen sending ACK_FREQUENCY frames is enabled through\n`TransportConfig::ack_frequency_config(Some(..))`, the peer's transport parameters could cause\n`AckFrequencyState::candidate_max_ack_delay` to call `Duration::clamp` with a minimum greater\nthan its maximum, which panics.\n\nFor example, a peer advertising a `min_ack_delay` of 100,000 microseconds and a `max_ack_delay`\nof 100 milliseconds passes transport parameter validation. At a 5 ms RTT, the lower bound of the\nclamp becomes 100 ms while the upper bound is 25 ms, violating the precondition of `clamp` and\npanicking while driving the connection. Both automatically derived and explicitly configured\nmaximum ACK delays use this calculation.\n\nSending ACK_FREQUENCY frames is disabled by default, so only endpoints that opt in are affected.\n\nThe flaw was corrected in 0.11.18 by computing the delay with explicit minimum and maximum bounds\ninstead of `clamp`.\n\nThanks to [@zerox80](https://github.com/zerox80) for reporting this issue.","dates":{"published":"2026-09-14T12:00:00.000Z","modified":"2026-10-12T18:15:01.975Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"OSV · Crates.io","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":true,"selection":"version-preference"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Crates.io","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","exploitability":10,"impact":6,"computed":true}]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"Crates.Io","product":"quinn-proto","name":"quinn-proto","label":"quinn-proto","ecosystem":"Crates.Io","cpePart":null,"purl":"pkg:cargo/quinn-proto","purlType":"cargo","versions":[{"text":"≥ 0.11.0, < 0.11.18","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 0.11.0, < 0.11.18","eol":null,"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://crates.io/crates/quinn-proto","label":"crates.io/crates/quinn-proto","hostname":"crates.io","tags":["PACKAGE"]},{"url":"https://rustsec.org/advisories/RUSTSEC-2026-0340.html","label":"rustsec.org/advisories/RUSTSEC-2026-0340.html","hostname":"rustsec.org","tags":["Advisory"]},{"url":"https://github.com/quinn-rs/quinn/pull/2868","label":"github.com/quinn-rs/quinn/pull/2868","hostname":"github.com","tags":["WEB"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-14T12:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-12T18:15:01.975Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T12:12:13.373Z","stale":false,"partial":false}}