{"id":"DEBIAN-CVE-2026-73646","details":"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.","modified":"2026-09-19T23:00:21.743404544Z","published":"2026-08-17T16:17:47.257Z","upstream":["CVE-2026-73646"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-73646"}],"affected":[{"package":{"name":"node-postcss","ecosystem":"Debian:12","purl":"pkg:deb/debian/node-postcss?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.4.20+~cs8.0.23-1","8.4.20+~cs8.0.23-1+deb12u1","8.4.31+~cs8.0.26-1","8.4.39+~cs9.2.29-1","8.4.49+~cs9.2.32-1","8.5.12+~cs9.3.32-1","8.5.14+~cs9.3.34-1","8.5.15+~cs9.3.34-1","8.5.15+~cs9.3.38-1","8.5.15+~cs9.3.39-1","8.5.19+~cs10.2.23-1","8.5.21+~cs10.2.23-1","8.5.23+~cs10.2.23-1","8.5.25+~cs10.2.23-1","8.5.26+~cs10.2.24-1","8.5.28+~cs10.2.24-1","8.5.6+~cs9.3.28-1","8.5.8+~cs9.3.30-1","8.5.9+~cs9.3.30-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73646.json"}},{"package":{"name":"node-postcss","ecosystem":"Debian:13","purl":"pkg:deb/debian/node-postcss?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.4.49+~cs9.2.32-1","8.5.12+~cs9.3.32-1","8.5.14+~cs9.3.34-1","8.5.15+~cs9.3.34-1","8.5.15+~cs9.3.38-1","8.5.15+~cs9.3.39-1","8.5.19+~cs10.2.23-1","8.5.21+~cs10.2.23-1","8.5.23+~cs10.2.23-1","8.5.25+~cs10.2.23-1","8.5.26+~cs10.2.24-1","8.5.28+~cs10.2.24-1","8.5.6+~cs9.3.28-1","8.5.8+~cs9.3.30-1","8.5.9+~cs9.3.30-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73646.json"}},{"package":{"name":"node-postcss","ecosystem":"Debian:14","purl":"pkg:deb/debian/node-postcss?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.19+~cs10.2.23-1"}]}],"versions":["8.4.49+~cs9.2.32-1","8.5.12+~cs9.3.32-1","8.5.14+~cs9.3.34-1","8.5.15+~cs9.3.34-1","8.5.15+~cs9.3.38-1","8.5.15+~cs9.3.39-1","8.5.6+~cs9.3.28-1","8.5.8+~cs9.3.30-1","8.5.9+~cs9.3.30-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-73646.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}