{"cve":"CVE-2021-43790","nvd":{"published":"2021-11-30T00:15:07.357","modified":"2026-06-17T04:11:26.707","status":"Modified","description":"Lucet is a native WebAssembly compiler and runtime. There is a bug in the main branch of `lucet-runtime` affecting all versions published to crates.io that allows a use-after-free in an Instance object that could result in memory corruption, data race, or other related issues. This bug was introduced early in the development of Lucet and is present in all releases. As a result of this bug, and dependent on the memory backing for the Instance objects, it is possible to trigger a use-after-free when the Instance is dropped. Users should upgrade to the main branch of the Lucet repository. Lucet no longer provides versioned releases on crates.io. There is no way to remediate this vulnerability without upgrading.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1},"cwes":["CWE-416"],"references":["https://crates.io/crates/lucet-runtime","https://github.com/bytecodealliance/lucet/commit/7c7757c772fb709c61b1442bcc1e1fbee97bf4a8","https://github.com/bytecodealliance/lucet/security/advisories/GHSA-hf79-8hjp-rrvq","https://crates.io/crates/lucet-runtime","https://github.com/bytecodealliance/lucet/commit/7c7757c772fb709c61b1442bcc1e1fbee97bf4a8"],"products":["bytecodealliance:lucet"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-43790","score":0.01617,"percentile":0.76043,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-hf79-8hjp-rrvq","url":"https://osv.dev/vulnerability/GHSA-hf79-8hjp-rrvq","summary":"Use After Free in lucet","modified":"2026-07-08T06:29:00.324923520Z","packages":[{"ecosystem":"crates.io","name":"lucet-runtime","purl":"pkg:cargo/lucet-runtime","ranges":["<=0.6.1"],"fixed":[]}]},{"id":"RUSTSEC-2021-0155","url":"https://osv.dev/vulnerability/RUSTSEC-2021-0155","summary":"Use After Free in lucet-runtime","modified":"2026-10-12T18:00:04.412539855Z","packages":[{"ecosystem":"crates.io","name":"lucet-runtime","purl":"pkg:cargo/lucet-runtime","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."]}