CVE-2021-43138

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.

• CWE-1321

• https://github.com/caolan/async/blob/master/lib/internal/iterator.jsThird Party Advisory
• https://github.com/caolan/async/blob/master/lib/mapValuesLimit.jsThird Party Advisory
• https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md#v264Release Notes, Third Party Advisory
• https://github.com/caolan/async/commit/e1ecdbf79264f9ab488c7799f4c76996d5dca66dPatch, Third Party Advisory
• https://github.com/caolan/async/compare/v2.6.3...v2.6.4Patch, Third Party Advisory
• https://github.com/caolan/async/pull/1828Patch, Third Party Advisory
• https://jsfiddle.net/oz5twjd9/Exploit, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTEUUTNIEBHGKUKKLNUZSV7IEP6IP3Q3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UM6XJ73Q3NAM5KSGCOKJ2ZIA6GUWUJLK/
• https://security.netapp.com/advisory/ntap-20240621-0006/
• https://github.com/caolan/async/blob/master/lib/internal/iterator.jsThird Party Advisory
• https://github.com/caolan/async/blob/master/lib/mapValuesLimit.jsThird Party Advisory
• https://github.com/caolan/async/blob/v2.6.4/CHANGELOG.md#v264Release Notes, Third Party Advisory
• https://github.com/caolan/async/commit/e1ecdbf79264f9ab488c7799f4c76996d5dca66dPatch, Third Party Advisory
• https://github.com/caolan/async/compare/v2.6.3...v2.6.4Patch, Third Party Advisory
• https://github.com/caolan/async/pull/1828Patch, Third Party Advisory
• https://jsfiddle.net/oz5twjd9/Exploit, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MTEUUTNIEBHGKUKKLNUZSV7IEP6IP3Q3/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UM6XJ73Q3NAM5KSGCOKJ2ZIA6GUWUJLK/
• https://security.netapp.com/advisory/ntap-20240621-0006/

Published

Apr 6, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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