UnratedFix available

DEBIAN-CVE-2026-73646

Type: advisorySource: OSV1 source record

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 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.

Announced 17 Aug 2026Group revision 1

Original source ↗

DEBIAN-CVE-2026-73646

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-73646

node-postcss

Source reference: /affected/0/package/name

Affected versions: 8.4.20+~cs8.0.23-1
Source reference: /affected/0/versions
8.4.20+~cs8.0.23-1+deb12u1
Source reference: /affected/0/versions
8.4.31+~cs8.0.26-1
Source reference: /affected/0/versions
8.4.39+~cs9.2.29-1
Source reference: /affected/0/versions
8.4.49+~cs9.2.32-1
Source reference: /affected/0/versions
8.5.12+~cs9.3.32-1
Source reference: /affected/0/versions
8.5.14+~cs9.3.34-1
Source reference: /affected/0/versions
8.5.15+~cs9.3.34-1
Source reference: /affected/0/versions
8.5.15+~cs9.3.38-1
Source reference: /affected/0/versions
8.5.15+~cs9.3.39-1
Source reference: /affected/0/versions
8.5.19+~cs10.2.23-1
Source reference: /affected/0/versions
8.5.21+~cs10.2.23-1
Source reference: /affected/0/versions
8.5.23+~cs10.2.23-1
Source reference: /affected/0/versions
8.5.25+~cs10.2.23-1
Source reference: /affected/0/versions
8.5.26+~cs10.2.24-1
Source reference: /affected/0/versions
8.5.28+~cs10.2.24-1
Source reference: /affected/0/versions
8.5.6+~cs9.3.28-1
Source reference: /affected/0/versions
8.5.8+~cs9.3.30-1
Source reference: /affected/0/versions
8.5.9+~cs9.3.30-1
Source reference: /affected/0/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

node-postcss

Source reference: /affected/1/package/name

Affected versions: 8.4.49+~cs9.2.32-1
Source reference: /affected/1/versions
8.5.12+~cs9.3.32-1
Source reference: /affected/1/versions
8.5.14+~cs9.3.34-1
Source reference: /affected/1/versions
8.5.15+~cs9.3.34-1
Source reference: /affected/1/versions
8.5.15+~cs9.3.38-1
Source reference: /affected/1/versions
8.5.15+~cs9.3.39-1
Source reference: /affected/1/versions
8.5.19+~cs10.2.23-1
Source reference: /affected/1/versions
8.5.21+~cs10.2.23-1
Source reference: /affected/1/versions
8.5.23+~cs10.2.23-1
Source reference: /affected/1/versions
8.5.25+~cs10.2.23-1
Source reference: /affected/1/versions
8.5.26+~cs10.2.24-1
Source reference: /affected/1/versions
8.5.28+~cs10.2.24-1
Source reference: /affected/1/versions
8.5.6+~cs9.3.28-1
Source reference: /affected/1/versions
8.5.8+~cs9.3.30-1
Source reference: /affected/1/versions
8.5.9+~cs9.3.30-1
Source reference: /affected/1/versions
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

node-postcss

Source reference: /affected/2/package/name

Affected versions: 8.4.49+~cs9.2.32-1
Source reference: /affected/2/versions
8.5.12+~cs9.3.32-1
Source reference: /affected/2/versions
8.5.14+~cs9.3.34-1
Source reference: /affected/2/versions
8.5.15+~cs9.3.34-1
Source reference: /affected/2/versions
8.5.15+~cs9.3.38-1
Source reference: /affected/2/versions
8.5.15+~cs9.3.39-1
Source reference: /affected/2/versions
8.5.6+~cs9.3.28-1
Source reference: /affected/2/versions
8.5.8+~cs9.3.30-1
Source reference: /affected/2/versions
8.5.9+~cs9.3.30-1
Source reference: /affected/2/versions
Fixed versions: 8.5.19+~cs10.2.23-1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-postcss",
      "purl": "pkg:deb/debian/node-postcss?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "8.4.20+~cs8.0.23-1",
      "8.4.20+~cs8.0.23-1+deb12u1",
      "8.4.31+~cs8.0.26-1",
      "8.4.39+~cs9.2.29-1",
      "8.4.49+~cs9.2.32-1",
      "8.5.12+~cs9.3.32-1",
      "8.5.14+~cs9.3.34-1",
      "8.5.15+~cs9.3.34-1",
      "8.5.15+~cs9.3.38-1",
      "8.5.15+~cs9.3.39-1",
      "8.5.19+~cs10.2.23-1",
      "8.5.21+~cs10.2.23-1",
      "8.5.23+~cs10.2.23-1",
      "8.5.25+~cs10.2.23-1",
      "8.5.26+~cs10.2.24-1",
      "8.5.28+~cs10.2.24-1",
      "8.5.6+~cs9.3.28-1",
      "8.5.8+~cs9.3.30-1",
      "8.5.9+~cs9.3.30-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73646.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-postcss",
      "purl": "pkg:deb/debian/node-postcss?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "8.4.49+~cs9.2.32-1",
      "8.5.12+~cs9.3.32-1",
      "8.5.14+~cs9.3.34-1",
      "8.5.15+~cs9.3.34-1",
      "8.5.15+~cs9.3.38-1",
      "8.5.15+~cs9.3.39-1",
      "8.5.19+~cs10.2.23-1",
      "8.5.21+~cs10.2.23-1",
      "8.5.23+~cs10.2.23-1",
      "8.5.25+~cs10.2.23-1",
      "8.5.26+~cs10.2.24-1",
      "8.5.28+~cs10.2.24-1",
      "8.5.6+~cs9.3.28-1",
      "8.5.8+~cs9.3.30-1",
      "8.5.9+~cs9.3.30-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73646.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "8.5.19+~cs10.2.23-1"
          }
        ]
      }
    ],
    "package": {
      "name": "node-postcss",
      "purl": "pkg:deb/debian/node-postcss?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "8.4.49+~cs9.2.32-1",
      "8.5.12+~cs9.3.32-1",
      "8.5.14+~cs9.3.34-1",
      "8.5.15+~cs9.3.34-1",
      "8.5.15+~cs9.3.38-1",
      "8.5.15+~cs9.3.39-1",
      "8.5.6+~cs9.3.28-1",
      "8.5.8+~cs9.3.30-1",
      "8.5.9+~cs9.3.30-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73646.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #58463 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 18:04:40 GMT
Publisher date: Mon, 17 Aug 2026 16:17:47 GMT

Read the original announcement

Revision history

25 Oct 2026DEBIAN-CVE-2026-73646 · Revision 1Source updated