{"cve":"CVE-2021-43138","nvd":{"published":"2022-04-06T17:15:08.650","modified":"2026-06-17T04:10:32.767","status":"Modified","description":"In Async before 2.6.4 and 3.x before 3.2.2, a malicious user can obtain privileges via the mapValues() method, aka lib/internal/iterator.js createObjectIterator prototype pollution.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-1321"],"references":["https://github.com/caolan/async/blob/master/lib/internal/iterator.js","https://github.com/caolan/async/blob/master/lib/mapValuesLimit.js","https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md#v264","https://github.com/caolan/async/commit/e1ecdbf79264f9ab488c7799f4c76996d5dca66d","https://github.com/caolan/async/compare/v2.6.3...v2.6.4"],"products":["async_project:async","fedoraproject:fedora"],"source":"nvd","synced_at":"2026-10-19T21:29:06.454770966+00:00"},"epss":{"cve":"CVE-2021-43138","score":0.03346,"percentile":0.88673,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-fwr7-v2mv-hh25","url":"https://osv.dev/vulnerability/GHSA-fwr7-v2mv-hh25","summary":"Prototype Pollution in async","modified":"2024-06-24T21:23:09Z","packages":[{"ecosystem":"npm","name":"async","purl":"pkg:npm/async","ranges":[">=3.0.0 <3.2.2"],"fixed":["3.2.2"]},{"ecosystem":"npm","name":"async","purl":"pkg:npm/async","ranges":[">=2.0.0 <2.6.4"],"fixed":["2.6.4"]}]}],"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."]}