{"cve":"CVE-2021-31996","nvd":{"published":"2021-05-03T07:15:07.577","modified":"2026-06-17T03:52:38.717","status":"Modified","description":"An issue was discovered in the algorithmica crate through 2021-03-07 for Rust. There is a double free in merge_sort::merge().","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-415"],"references":["https://rustsec.org/advisories/RUSTSEC-2021-0053.html","https://rustsec.org/advisories/RUSTSEC-2021-0053.html"],"products":["algorithmica_project:algorithmica"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-31996","score":0.00961,"percentile":0.61598,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jh37-772x-4hpw","url":"https://osv.dev/vulnerability/GHSA-jh37-772x-4hpw","summary":"Double free in algorithmica","modified":"2023-11-08T04:05:51.884944Z","packages":[{"ecosystem":"crates.io","name":"algorithmica","purl":"pkg:cargo/algorithmica","ranges":["<=0.1.8"],"fixed":[]}]},{"id":"RUSTSEC-2021-0053","url":"https://osv.dev/vulnerability/RUSTSEC-2021-0053","summary":"'merge_sort::merge()' crashes with double-free for `T: Drop`","modified":"2023-11-08T04:05:51.884944Z","packages":[{"ecosystem":"crates.io","name":"algorithmica","purl":"pkg:cargo/algorithmica","ranges":[">=0.0.0-0"],"fixed":[]}]}],"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."]}