{"id":"CVE-2021-43138","aliases":["GHSA-fwr7-v2mv-hh25"],"url":"https://o3.security/vulnerability/CVE-2021-43138","summary":"Prototype Pollution in async","details":"A vulnerability exists in Async through 3.2.1 for 3.x and through 2.6.3 for 2.x (fixed in 3.2.2 and 2.6.4), which could let a malicious user obtain privileges via the `mapValues()` method.","published":"2022-04-06T17:15:08.650Z","modified":"2026-07-08T06:00:32.423380324Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"async","fixedVersion":"3.2.2"},{"ecosystem":"npm","name":"async","fixedVersion":"2.6.4"}],"fix":{"url":"https://github.com/caolan/async/commit/e1ecdbf79264f9ab488c7799f4c76996d5dca66d","label":"caolan/async@e1ecdbf"},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTEUUTNIEBHGKUKKLNUZSV7IEP6IP3Q3/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UM6XJ73Q3NAM5KSGCOKJ2ZIA6GUWUJLK/"},{"type":"ADVISORY","url":"https://github.com/caolan/async/blob/master/lib/internal/iterator.js"},{"type":"ADVISORY","url":"https://github.com/caolan/async/blob/master/lib/mapValuesLimit.js"},{"type":"ADVISORY","url":"https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md#v264"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20240621-0006/"},{"type":"FIX","url":"https://github.com/caolan/async/commit/e1ecdbf79264f9ab488c7799f4c76996d5dca66d"},{"type":"FIX","url":"https://github.com/caolan/async/compare/v2.6.3...v2.6.4"},{"type":"FIX","url":"https://github.com/caolan/async/pull/1828"},{"type":"EVIDENCE","url":"https://jsfiddle.net/oz5twjd9/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43138"},{"type":"WEB","url":"https://github.com/caolan/async/commit/8f7f90342a6571ba1c197d747ebed30c368096d2"},{"type":"PACKAGE","url":"https://github.com/caolan/async"},{"type":"WEB","url":"https://jsfiddle.net/oz5twjd9"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTEUUTNIEBHGKUKKLNUZSV7IEP6IP3Q3"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UM6XJ73Q3NAM5KSGCOKJ2ZIA6GUWUJLK"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MTEUUTNIEBHGKUKKLNUZSV7IEP6IP3Q3"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UM6XJ73Q3NAM5KSGCOKJ2ZIA6GUWUJLK"},{"type":"WEB","url":"https://security.netapp.com/advisory/ntap-20240621-0006"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:00:32.423380324Z"}}