Medium
node-postcss — security advisory
PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map’s sources and sourcesContent may then be exposed to the application. This issue is fixed in version 8.5.19.
- Products
- node-postcss
- Affected versions
- 6.0.23-1, 6.0.23-3, 8.2.1+~cs5.3.23-8, 8.4.20+~cs8.0.23-1, 8.4.31+~cs8.0.26-1, 8.4.5+~cs7.1.51-2, 8.4.6+~cs7.3.21-1, 8.5.15+~cs9.3.34-1, 8.5.15+~cs9.3.38-1, 8.5.15+~cs9.3.39-1build1, 8.5.25+~cs10.2.23-1, 8.5.26+~cs10.2.24-1, 8.5.6+~cs9.3.28-1, 8.5.8+~cs9.3.30-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-69153
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:51 UTC · Revision 1
Source evidence
PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map’s sources and sourcesContent may then be exposed to the application. This issue is fixed in version 8.5.19.
osv:UBUNTU-CVE-2026-69153
node-postcss
Fixed versions: Not specified
node-postcss
Fixed versions: Not specified
node-postcss
Fixed versions: Not specified
node-postcss
Fixed versions: Not specified
node-postcss
Fixed versions: Not specified
Complete source record
{
"id": "b71fafb976e578be9f5c8ff73621aa8bd8a433b7289029c62f2aa5229eb396df",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-69153",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-69153",
"summary": "PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map’s sources and sourcesContent may then be exposed to the application. This issue is fixed in version 8.5.19.",
"evidence": "osv:UBUNTU-CVE-2026-69153",
"products": [
{
"name": {
"value": "node-postcss",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "6.0.23-1",
"evidence": "/affected/0/versions"
},
{
"value": "6.0.23-3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "node-postcss",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "8.2.1+~cs5.3.23-8",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.5+~cs7.1.51-2",
"evidence": "/affected/1/versions"
},
{
"value": "8.4.6+~cs7.3.21-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "node-postcss",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "8.4.20+~cs8.0.23-1",
"evidence": "/affected/2/versions"
},
{
"value": "8.4.31+~cs8.0.26-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "node-postcss",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "8.5.8+~cs9.3.30-1",
"evidence": "/affected/3/versions"
},
{
"value": "8.5.15+~cs9.3.34-1",
"evidence": "/affected/3/versions"
},
{
"value": "8.5.15+~cs9.3.38-1",
"evidence": "/affected/3/versions"
},
{
"value": "8.5.15+~cs9.3.39-1build1",
"evidence": "/affected/3/versions"
},
{
"value": "8.5.25+~cs10.2.23-1",
"evidence": "/affected/3/versions"
},
{
"value": "8.5.26+~cs10.2.24-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "node-postcss",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "8.5.6+~cs9.3.28-1",
"evidence": "/affected/4/versions"
},
{
"value": "8.5.8+~cs9.3.30-1",
"evidence": "/affected/4/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-69153",
"aliases": [
"UBUNTU-CVE-2026-69153"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-postcss",
"purl": "pkg:deb/ubuntu/node-postcss?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"6.0.23-1",
"6.0.23-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69153.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-postcss",
"binary_version": "6.0.23-3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-postcss",
"purl": "pkg:deb/ubuntu/node-postcss?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"8.2.1+~cs5.3.23-8",
"8.4.5+~cs7.1.51-2",
"8.4.6+~cs7.3.21-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69153.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-postcss",
"binary_version": "8.4.6+~cs7.3.21-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-postcss",
"purl": "pkg:deb/ubuntu/node-postcss?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"8.4.20+~cs8.0.23-1",
"8.4.31+~cs8.0.26-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69153.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-postcss",
"binary_version": "8.4.31+~cs8.0.26-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-postcss",
"purl": "pkg:deb/ubuntu/node-postcss?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"8.5.8+~cs9.3.30-1",
"8.5.15+~cs9.3.34-1",
"8.5.15+~cs9.3.38-1",
"8.5.15+~cs9.3.39-1build1",
"8.5.25+~cs10.2.23-1",
"8.5.26+~cs10.2.24-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69153.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-postcss",
"binary_version": "8.5.26+~cs10.2.24-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-postcss",
"purl": "pkg:deb/ubuntu/node-postcss?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"8.5.6+~cs9.3.28-1",
"8.5.8+~cs9.3.30-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69153.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-postcss",
"binary_version": "8.5.8+~cs9.3.30-1"
}
]
}
}
],
"modified": "2026-10-17T12:59:26.797648515Z",
"provider": "osv",
"upstream": [
"CVE-2026-69153"
],
"references": [
"https://ubuntu.com/security/CVE-2026-69153",
"https://www.cve.org/CVERecord?id=CVE-2026-69153",
"https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp",
"https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8",
"https://github.com/postcss/postcss/releases/tag/8.5.19"
]
},
"related_cves": [
{
"value": "CVE-2026-69153",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359653,
"published_at": "2026-08-03T17:16:00+00:00"
}