withastro up to 5.15.7 decodeURI path traversal

Summaryinfo

A vulnerability labeled as critical has been found in withastro astro up to 5.15.7. This affects the function decodeURI. Such manipulation leads to path traversal. This vulnerability is uniquely identified as CVE-2025-64765. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in withastro astro up to 5.15.7. It has been rated as critical. Affected by this issue is the function decodeURI. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. CVE summarizes:

Astro is a web framework. Prior to version 5.15.8, a mismatch exists between how Astro normalizes request paths for routing/rendering and how the application’s middleware reads the path for validation checks. Astro internally applies decodeURI() to determine which route to render, while the middleware uses context.url.pathname without applying the same normalization (decodeURI). This discrepancy may allow attackers to reach protected routes using encoded path variants that pass routing but bypass validation checks. This issue has been patched in version 5.15.8.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2025-64765 since 11/10/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 5.15.8 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-198183). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• withastro

Name

• astro

Version

• 5.15.0
• 5.15.1
• 5.15.2
• 5.15.3
• 5.15.4
• 5.15.5
• 5.15.6
• 5.15.7

Website

• Product: https://github.com/withastro/astro/

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Once again VulDB remains the best source for vulnerability data.

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