HighFix available
node-js-yaml — security advisory
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0.
- Products
- node-js-yaml
- Affected versions
- 4.1.0+dfsg+~4.0.5-7, 4.1.1+dfsg+~4.0.9-1, 4.2.0+~4.0.9-1, 4.2.0+~4.0.9-2, 4.3.2+~4.0.9-1
- Fixed versions
- 4.2.0+~4.0.9-2
- CVEs
- CVE-2026-59869
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:18 UTC · Revision 2
Source evidence
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0.
osv:DEBIAN-CVE-2026-59869
node-js-yaml
Fixed versions: Not specified
node-js-yaml
Fixed versions: Not specified
node-js-yaml
Fixed versions: 4.2.0+~4.0.9-2
Complete source record
{
"id": "362f9525ca63cf5bbd99324e152d67904e81990368779ec19e2b4f4f992eb9d3",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-59869",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-59869",
"summary": "js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 before 3.15.0 and from 4.0.0 before 4.3.0, js-yaml can spend quadratic CPU time parsing a document whose size grows only linearly when a chain of mappings uses merge keys where each mapping merges the previous one. This issue is fixed in versions 3.15.0 and 4.3.0.",
"evidence": "osv:DEBIAN-CVE-2026-59869",
"products": [
{
"name": {
"value": "node-js-yaml",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.1.0+dfsg+~4.0.5-7",
"evidence": "/affected/0/versions"
},
{
"value": "4.1.1+dfsg+~4.0.9-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.2.0+~4.0.9-1",
"evidence": "/affected/0/versions"
},
{
"value": "4.2.0+~4.0.9-2",
"evidence": "/affected/0/versions"
},
{
"value": "4.3.2+~4.0.9-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "node-js-yaml",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "4.1.0+dfsg+~4.0.5-7",
"evidence": "/affected/1/versions"
},
{
"value": "4.1.1+dfsg+~4.0.9-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.2.0+~4.0.9-1",
"evidence": "/affected/1/versions"
},
{
"value": "4.2.0+~4.0.9-2",
"evidence": "/affected/1/versions"
},
{
"value": "4.3.2+~4.0.9-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "node-js-yaml",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "4.2.0+~4.0.9-2",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "4.1.0+dfsg+~4.0.5-7",
"evidence": "/affected/2/versions"
},
{
"value": "4.1.1+dfsg+~4.0.9-1",
"evidence": "/affected/2/versions"
},
{
"value": "4.2.0+~4.0.9-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-59869",
"aliases": [
"DEBIAN-CVE-2026-59869"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-js-yaml",
"purl": "pkg:deb/debian/node-js-yaml?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"4.1.0+dfsg+~4.0.5-7",
"4.1.1+dfsg+~4.0.9-1",
"4.2.0+~4.0.9-1",
"4.2.0+~4.0.9-2",
"4.3.2+~4.0.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59869.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-js-yaml",
"purl": "pkg:deb/debian/node-js-yaml?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"4.1.0+dfsg+~4.0.5-7",
"4.1.1+dfsg+~4.0.9-1",
"4.2.0+~4.0.9-1",
"4.2.0+~4.0.9-2",
"4.3.2+~4.0.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59869.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "4.2.0+~4.0.9-2"
}
]
}
],
"package": {
"name": "node-js-yaml",
"purl": "pkg:deb/debian/node-js-yaml?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"4.1.0+dfsg+~4.0.5-7",
"4.1.1+dfsg+~4.0.9-1",
"4.2.0+~4.0.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59869.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T11:47:31.743814072Z",
"provider": "osv",
"upstream": [
"CVE-2026-59869"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-59869"
]
},
"related_cves": [
{
"value": "CVE-2026-59869",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450822,
"published_at": "2026-07-08T16:16:33.423+00:00"
}