{"id":"CVE-2018-20996","aliases":["GHSA-c3cw-c387-pj65","RUSTSEC-2018-0009"],"url":"https://o3.security/vulnerability/CVE-2018-20996","summary":"Double free in crossbeam","details":"Even if an element is popped from a queue, crossbeam would run its destructor inside the epoch-based garbage collector. This is a source of double frees.\n\nThe flaw was corrected by wrapping elements inside queues in a ManuallyDrop.","published":"2019-08-26T18:15:11.607Z","modified":"2026-07-08T19:01:34.202604Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"crossbeam","fixedVersion":"0.4.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://rustsec.org/advisories/RUSTSEC-2018-0009.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-20996"},{"type":"WEB","url":"https://github.com/crossbeam-rs/crossbeam-epoch/issues/82"},{"type":"PACKAGE","url":"https://github.com/crossbeam-rs/crossbeam-epoch"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T19:01:34.202604Z"}}