{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "8.5.18"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "95663d3eb7ba26f4854dd19d3b4f4425760cf56c"
            },
            {
              "fixed": "4c0d194c136fd374495d0993c890d794cab65b81"
            }
          ],
          "repo": "https://github.com/postcss/postcss",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-r28c-9q8g-f849"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73646.json"
  },
  "details": "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.",
  "id": "CVE-2026-73646",
  "modified": "2026-08-19T03:31:23.447461939Z",
  "published": "2026-08-17T15:35:13.518Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/postcss/postcss/releases/tag/8.5.18"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73646.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/postcss/postcss/security/advisories/GHSA-r28c-9q8g-f849"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73646"
    },
    {
      "type": "FIX",
      "url": "https://github.com/postcss/postcss/commit/95663d3eb7ba26f4854dd19d3b4f4425760cf56c"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure"
}