Bug 2517456 (CVE-2026-73646) - CVE-2026-73646 postcss: PostCSS: Information disclosure via path traversal in source map auto-loading
Summary: CVE-2026-73646 postcss: PostCSS: Information disclosure via path traversal in...
Keywords:
Status: NEW
Alias: CVE-2026-73646
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-17 15:47 UTC by OSIDB Bzimport
Modified: 2026-08-28 02:47 UTC (History)
151 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-08-17 15:47:09 UTC 
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.
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