CVE-2026-69153

Name	CVE-2026-69153
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 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map’s sources and sourcesContent may then be exposed to the application. This issue is fixed in version 8.5.19.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
node-postcss (PTS)	bullseye	8.2.1+~cs5.3.23-8	vulnerable
	bullseye (security)	8.2.1+~cs5.3.23-8+deb11u1	vulnerable
	bookworm	8.4.20+~cs8.0.23-1+deb12u1	vulnerable
	trixie	8.4.49+~cs9.2.32-1	vulnerable
	forky, sid	8.5.26+~cs10.2.24-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
node-postcss	source	(unstable)	8.5.23+~cs10.2.23-1

Notes

[trixie] - node-postcss <no-dsa> (Minor issue)
https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp
Fixed by: https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8 (8.5.23)