{"cve":"CVE-2018-20991","nvd":{"published":"2019-08-26T15:15:11.390","modified":"2026-06-17T01:53:53.667","status":"Modified","description":"An issue was discovered in the smallvec crate before 0.6.3 for Rust. The Iterator implementation mishandles destructors, leading to a double free.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-415"],"references":["https://rustsec.org/advisories/RUSTSEC-2018-0003.html","https://rustsec.org/advisories/RUSTSEC-2018-0003.html"],"products":["servo:smallvec"],"source":"nvd","synced_at":"2026-10-19T20:58:39.700375520+00:00"},"epss":{"cve":"CVE-2018-20991","score":0.01848,"percentile":0.79088,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-rxr4-x558-x7hw","url":"https://osv.dev/vulnerability/GHSA-rxr4-x558-x7hw","summary":"Double free in smallvec","modified":"2023-11-08T04:00:13.368337Z","packages":[{"ecosystem":"crates.io","name":"smallvec","purl":"pkg:cargo/smallvec","ranges":[">=0.3.2 <0.6.3"],"fixed":["0.6.3"]}]},{"id":"RUSTSEC-2018-0003","url":"https://osv.dev/vulnerability/RUSTSEC-2018-0003","summary":"Possible double free during unwinding in SmallVec::insert_many","modified":"2026-07-17T16:00:03.239783240Z","packages":[{"ecosystem":"crates.io","name":"smallvec","purl":"pkg:cargo/smallvec","ranges":[">=0.3.2 <0.3.4",">=0.4.0-0 <0.4.5",">=0.5.0-0 <0.5.1",">=0.6.0-0 <0.6.3"],"fixed":["0.3.4","0.4.5","0.5.1","0.6.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}