astro-5.18.1.tgz: 2 vulnerabilities (highest severity is: 6.1)

[mend-for-github-com]

Vulnerable Library - astro-5.18.1.tgz

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

Library home page: https://registry.npmjs.org/astro/-/astro-5.18.1.tgz

Path to dependency file: /docs/starlight-docs/package.json

Path to vulnerable library: /docs/starlight-docs/package.json,/docs/package.json

Found in HEAD commit: ec994c1a9bf5ae33c1721ef3568d20d917573751

Vulnerabilities

Vulnerability	Severity	CVSS	Dependency	Type	Fixed in (astro version)	Remediation Possible**
CVE-2026-41305	Medium	6.1	postcss-8.5.6.tgz	Transitive	N/A*	❌
CVE-2026-41067	Medium	6.1	astro-5.18.1.tgz	Direct	6.1.6	✅

*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-2026-41305

Vulnerable Library - postcss-8.5.6.tgz

Tool for transforming styles with JS plugins

Library home page: https://registry.npmjs.org/postcss/-/postcss-8.5.6.tgz

Path to dependency file: /docs/package.json

Path to vulnerable library: /docs/package.json,/docs/starlight-docs/package.json

Dependency Hierarchy:

• astro-5.18.1.tgz (Root Library)
  • vite-6.4.2.tgz
    • ❌ postcss-8.5.6.tgz (Vulnerable Library)

Found in HEAD commit: ec994c1a9bf5ae33c1721ef3568d20d917573751

Found in base branch: main

Vulnerability Details

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Versions prior to 8.5.10 do not escape "</style>" sequences when stringifying CSS ASTs. When user-submitted CSS is parsed and re-stringified for embedding in HTML "<style>" tags, "</style>" in CSS values breaks out of the style context, enabling XSS. Version 8.5.10 fixes the issue.

Publish Date: 2026-04-24

URL: CVE-2026-41305

CVSS 3 Score Details (6.1)

Base Score Metrics:

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-qx2v-qp2m-jg93

Release Date: 2026-04-24

Fix Resolution: postcss - 8.5.10,https://github.com/postcss/postcss.git - 8.5.10

CVE-2026-41067

Vulnerable Library - astro-5.18.1.tgz

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

Library home page: https://registry.npmjs.org/astro/-/astro-5.18.1.tgz

Path to dependency file: /docs/starlight-docs/package.json

Path to vulnerable library: /docs/starlight-docs/package.json,/docs/package.json

Dependency Hierarchy:

• ❌ astro-5.18.1.tgz (Vulnerable Library)

Found in HEAD commit: ec994c1a9bf5ae33c1721ef3568d20d917573751

Found in base branch: main

Vulnerability Details

Astro is a web framework. Prior to 6.1.6, the defineScriptVars function in Astro's server-side rendering pipeline uses a case-sensitive regex /</script>/g to sanitize values injected into inline <script> tags via the define:vars directive. HTML parsers close <script> elements case-insensitively and also accept whitespace or / before the closing >, allowing an attacker to bypass the sanitization with payloads like </Script>, </script >, or </script/> and inject arbitrary HTML/JavaScript. This vulnerability is fixed in 6.1.6.
Mend Note: The description of this vulnerability differs from MITRE.

Publish Date: 2026-04-24

URL: CVE-2026-41067

CVSS 3 Score Details (6.1)

Base Score Metrics:

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-j687-52p2-xcff

Release Date: 2026-04-24

Fix Resolution: 6.1.6

⛑️ Automatic Remediation will be attempted for this issue.

---

⛑️Automatic Remediation will be attempted for this issue.

[mend-for-github-com]

✔️ This issue was automatically closed by Mend because the vulnerable library in the specific branch(es) was either marked as ignored or it is no longer part of the Mend inventory.

[mend-for-github-com]

ℹ️ This issue was automatically re-opened by Mend because the vulnerable library in the specific branch(es) has been detected in the Mend inventory.

[andrross]

Catch All Triage - 1 2