cssnano-7.1.8.tgz: 1 vulnerabilities (highest severity is: 4.3)

[mend-bolt-for-github]

Vulnerable Library - cssnano-7.1.8.tgz

Path to dependency file: /package.json

Path to vulnerable library: /home/wss-scanner/.yarn/berry/cache/postcss-selector-parser-npm-7.1.1-b4ce358dae-10c0.zip

Vulnerabilities

Vulnerability	Severity	CVSS	Dependency	Type	Fixed in (cssnano version)	Remediation Possible**
CVE-2026-9358	Medium	4.3	postcss-selector-parser-7.1.1.tgz	Transitive	N/A*	❌

*For some transitive vulnerabilities, there is no version of direct dependency with a fix. Check the "Details" section below to see if there is a version of transitive dependency where vulnerability is fixed.

**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation

Details

CVE-2026-9358

Vulnerable Library - postcss-selector-parser-7.1.1.tgz

> Selector parser with built in methods for working with selector strings.

Library home page: https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-7.1.1.tgz

Path to dependency file: /package.json

Path to vulnerable library: /home/wss-scanner/.yarn/berry/cache/postcss-selector-parser-npm-7.1.1-b4ce358dae-10c0.zip

Dependency Hierarchy:

• cssnano-7.1.8.tgz (Root Library)
  • cssnano-preset-default-7.0.16.tgz
    • postcss-calc-10.1.1.tgz
      • ❌ postcss-selector-parser-7.1.1.tgz (Vulnerable Library)

Found in base branch: main

Vulnerability Details

A vulnerability was determined in postcss up to 7.1.1. 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. 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)."

Publish Date: 2026-05-24

URL: CVE-2026-9358

CVSS 3 Score Details (4.3)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low

For more information on CVSS3 Scores, click here.

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