withastro up to 5.15.4 Request Header x-forwarded-proto/x-forwarded-port server-side request forgery

Summaryinfo

A vulnerability was found in withastro astro up to 5.15.4 and classified as critical. This affects an unknown part of the component Request Header Handler. Such manipulation of the argument x-forwarded-proto/x-forwarded-port leads to server-side request forgery. This vulnerability is listed as CVE-2025-64525. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in withastro astro up to 5.15.4. It has been rated as critical. Affected by this issue is an unknown code of the component Request Header Handler. The manipulation of the argument x-forwarded-proto/x-forwarded-port with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Astro is a web framework. In Astro versions 2.16.0 up to but excluding 5.15.5 which utilizeon-demand rendering, request headers `x-forwarded-proto` and `x-forwarded-port` are insecurely used, without sanitization, to build the URL. This has several consequences, the most important of which are: middleware-based protected route bypass (only via `x-forwarded-proto`), DoS via cache poisoning (if a CDN is present), SSRF (only via `x-forwarded-proto`), URL pollution (potential SXSS, if a CDN is present), and WAF bypass. Version 5.15.5 contains a patch.

The advisory is available at github.com. This vulnerability is handled as CVE-2025-64525 since 11/05/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 5.15.5 eliminates this vulnerability. Applying the patch dafbb1ba29912099c4faff1440033edc768af8b4 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-175298). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• withastro

Name

• astro

Version

• 5.15.0
• 5.15.1
• 5.15.2
• 5.15.3
• 5.15.4

License

• open-source

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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