medium5.3
CVE-2026-69153
PostCSS: incomplete fix of GHSA-6g55-p6wh-862q — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | postcss | <= 8.5.22 | 8.5.23 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Postcss | Postcss | before 8.5.23 |