CVE-2026-73646: Postcss

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Postcss Postcss: before 8.5.18 (fixed in 8.5.18)

Published 2026-08-17. Last modified 2026-09-18.