Is CVE-2026-73646 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-73646?

CVE-2026-73646 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-73646

Description

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.