# CVE-2026-73646: node-postcss: PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstra...

CVE-2026-73646 is fixed in node-postcss on 1 platform by DEBIAN-CVE-2026-73646 (version 8.5.19+~cs10.2.23-1), released August 17, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-73646
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0053
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 17, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | node-postcss Debian 14 | 8.5.19+~cs10.2.23-1 | [DEBIAN-CVE-2026-73646](https://patchblox.com/security/data/fix/linux/debian-cve-2026-73646.md) | Aug 17, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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