PT-2026-42916 · Npm · Postcss

Bx33661 · Published 2026-05-24 · Updated 2026-05-24 · CVE-2026-9358

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions postcss versions prior to 7.1.2

Description An issue exists in the AST Serialization component within the toString() function of the src/selectors/container.js file. A remote attacker can perform a manipulation that leads to uncontrolled recursion, potentially causing a denial of service. This risk is primarily applicable to server-side environments processing user-generated CSS.

Recommendations Update to version 7.1.2 or later. As a temporary workaround, restrict the processing of user-generated CSS through the toString() function in the src/selectors/container.js file.

Exploit

Improper Resource Release

Uncontrolled Recursion

Weakness Enumeration

CWE-404

CWE-674

Related Identifiers

CVE-2026-9358

Affected Products

Postcss

References · 5

• 🔥 https://gist.github.com/bx33661/581e3a38134601c04e19b4dfc9b459b9 · Exploit
• https://vuldb.com/submit/813080 · Note
• https://twitter.com/CVEnew/status/2058530614605959173 · Twitter Post
• https://vuldb.com/vuln/365321 · Note
• https://vuldb.com/vuln/365321/cti · Note