HIGHVulnerability
CVE-2026-73646
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.
Properties
- severity
- HIGH
- score
- 7.5
- cve_id
- CVE-2026-73646
- signal_observed_at
- 2026-09-18T21:50:18+00:00
- vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- published_at
- 2026-08-17T16:17:47.257
- last_modified
- 2026-09-18T20:05:53.723
Related Entities (2)
HAS_WEAKNESS (1)
→[Weakness]Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
DESCRIBED_BY (1)
→[Source]NVD
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