High
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-43138
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:00 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-43138
Complete source record
{
"id": "5c5e7b39aaaeda5a1591321349ff220b4883ae3ea14a06719a33d0b13c7a4fc5",
"url": "https://osv.dev/vulnerability/CVE-2021-43138",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-43138",
"summary": "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.",
"evidence": "osv:CVE-2021-43138",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-43138",
"aliases": [
"CVE-2021-43138",
"GHSA-fwr7-v2mv-hh25"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/caolan/async",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "c6bdaca4f9175c14fc655d3783c6af6a883e6514"
},
{
"introduced": "72de392b6dffc466419ae7cab419d3b120d2459d"
},
{
"fixed": "acc084e6916a86e02ac5de8dbda0517e33106bf5"
},
{
"fixed": "e1ecdbf79264f9ab488c7799f4c76996d5dca66d"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:async_project:async:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.6.4"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:async_project:async:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.0"
},
{
"fixed": "3.2.2"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "e1ecdbf79264f9ab488c7799f4c76996d5dca66d"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"v2.6.3",
"v3.2.1",
"v3.2.0",
"v3.1.1",
"v2.6.2",
"v3.1.0",
"v3.0.1",
"v3.0.0",
"v2.6.1",
"v2.6.0",
"v2.5.0",
"v2.4.1",
"v2.4.0",
"v2.3.0",
"v2.2.0",
"v2.1.5",
"v2.1.4",
"v2.1.3",
"v2.1.2",
"v2.1.1",
"v2.1.0",
"v2.0.1",
"v2.0.0",
"v2.0.0-rc.6",
"v2.0.0-rc.5",
"v2.0.0-rc.4",
"v2.0.0-rc.3",
"v2.0.0-rc.2",
"v2.0.0-rc.1",
"v2.0.0-alpha.0",
"v1.5.2",
"v1.5.1",
"v1.5.0",
"v1.4.2",
"v1.4.0",
"v1.3.0",
"1.2.1",
"1.1.0",
"1.2.0",
"v1.2.0",
"1.0.0",
"0.9.2",
"0.9.1",
"0.9.0",
"0.8.0",
"0.7.0",
"0.6.2",
"0.6.1",
"0.6.0",
"0.5.0",
"0.4.1",
"0.4.0",
"0.3.0",
"0.2.10",
"0.2.9",
"0.2.8",
"0.2.7",
"0.2.6",
"v0.2.5",
"v0.2.4",
"v0.2.3",
"v0.2.2",
"v0.2.1",
"v0.2.0",
"v0.1.22",
"v0.1.21",
"v0.1.20",
"v0.1.19",
"v0.1.17",
"v0.1.15",
"v0.1.6",
"v0.1.5",
"v0.1.4",
"v0.1.3",
"v0.1.2",
"v0.1.1",
"v0.1.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-43138.json"
}
}
],
"modified": "2026-10-20T10:55:02.927382450Z",
"provider": "osv",
"references": [
"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://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://security.netapp.com/advisory/ntap-20240621-0006/",
"https://github.com/caolan/async/commit/e1ecdbf79264f9ab488c7799f4c76996d5dca66d",
"https://github.com/caolan/async/compare/v2.6.3...v2.6.4",
"https://github.com/caolan/async/pull/1828",
"https://jsfiddle.net/oz5twjd9/"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*",
"cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "36"
},
{
"last_affected": "36"
},
{
"introduced": "37"
},
{
"last_affected": "37"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-43138",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 386775,
"published_at": "2022-04-06T17:15:08.65+00:00"
}