CVE-2026-9358
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk34th percentile - higher than 34% of all known CVEs
Summary
A vulnerability was found in postcss-selector-parser up to versions 6.1.2/7.1.2, concerning the toString function in the src/selectors/container.js file. Manipulating this function can lead to uncontrolled recursion, allowing for remote attacks.
Risk Assessment
The vulnerability may lead to DoS attacks; however, the vendor states that the risk is low since most users compile their own CSS with PostCSS.
Recommendation
It is recommended to upgrade to versions 6.1.3 or 7.1.3 to address this vulnerability.
Original NVD description (English source)
A vulnerability was determined in postcss-selector-parser up to 6.1.2/7.1.2. Affected is the function toString of the file src/selectors/container.js of the component AST Serialization. Executing a manipulation can lead to uncontrolled recursion. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 6.1.3 and 7.1.3 is able to address this issue. This patch is called 5bc698cef66f8abd12610dc623e5d67cbc0f869d. It is suggested to upgrade the affected component. The vendor explains, that according to his definition "DoS on server-side on user-generated CSS is low risk for us (since most users compile own CSS with PostCSS)." The commits were backported to 6.x branch, which was the most downloaded version.