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CVE-2026-9358— postcss-selector-parser AST Serialization container.js toString recursion

Quick assessment

Affected
n/a postcss-selector-parser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PostCSS是PostCSS开源的一个样式转换工具。 PostCSS 7.1.1及之前版本存在安全漏洞，该漏洞源于组件AST Serialization中文件src/selectors/container.js的toString函数操作不当，可能导致不受控制的递归。

CVSS 4.3 · Medium EPSS 0.33% · P25

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 8

VendorProduct Version RangeStatus
n/a postcss-selector-parser 6.1.0 affected
6.1.1 affected
6.1.2 affected
7.1.0 affected
7.1.1 affected
7.1.2 affected
6.1.3 unaffected
7.1.3 unaffected
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I. Basic Information for CVE-2026-9358

Vulnerability Information
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Vulnerability Title
postcss-selector-parser AST Serialization container.js toString recursion
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
PostCSS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PostCSS是PostCSS开源的一个样式转换工具。 PostCSS 7.1.1及之前版本存在安全漏洞，该漏洞源于组件AST Serialization中文件src/selectors/container.js的toString函数操作不当，可能导致不受控制的递归。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- postcss-selector-parser 6.1.0 cpe:2.3:a:postcss-selector-parser:postcss-selector-parser:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-9358

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III. Intelligence Information for CVE-2026-9358

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Patches & Fixes for CVE-2026-9358 (1)

Proof of Concept for CVE-2026-9358 (1)

News Coverage for CVE-2026-9358 (1)

Vendor Pages for CVE-2026-9358 (1)

Same Patch Batch · n/a · 2026-05-24 · 5 CVEs total

CVE-2026-9376 6.3 MEDIUM JPress UCenter Article Submission Endpoint doWriteSave improper authorization
CVE-2026-9365 5.6 MEDIUM Ettercap GG Dissector ec_gg.c FUNC_DECODER heap-based overflow
CVE-2026-9373 3.7 LOW JeecgBoot OpenAPI Endpoint call improper authentication
CVE-2026-9357 3.5 LOW vBulletin Login cross site scripting

IV. Related Vulnerabilities

Same vendor: n/a
Same weakness: CWE-674

V. Comments for CVE-2026-9358

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