withastro up to 6.4.5 Host Header request.url input validation

Summaryinfo

A vulnerability classified as problematic was found in withastro astro up to 6.4.5. Affected is the function request.url of the component Host Header Handler. Executing a manipulation can lead to input validation. This vulnerability appears as CVE-2026-54299. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in withastro astro up to 6.4.5. It has been declared as problematic. This vulnerability affects the function request.url of the component Host Header Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Astro is a web framework. Prior to 6.4.6, Astro SSR apps with prerendered error pages (/404 or /500 using export const prerender = true) fetch those pages over HTTP at runtime when an error occurs. The URL for this fetch is derived from request.url, which in turn gets its origin from the incoming Host header. When the Host header is not validated against allowedDomains, an attacker can point the fetch at an arbitrary host and read the response. This vulnerability is fixed in 6.4.6.

The advisory is available at github.com. This vulnerability was named CVE-2026-54299 since 06/12/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 6.4.6 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-38337). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• withastro

Name

• astro

Version

• 6.4.0
• 6.4.1
• 6.4.2
• 6.4.3
• 6.4.4
• 6.4.5

Website

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

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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