withastro up to 11.0.1 Static File redirect

Summaryinfo

A vulnerability was found in withastro astro up to 11.0.1 and classified as problematic. The impacted element is an unknown function of the component Static File Handler. Executing a manipulation can lead to redirect. This vulnerability is tracked as CVE-2026-59730. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in withastro astro up to 11.0.1. It has been declared as problematic. This vulnerability affects an unknown code of the component Static File Handler. The manipulation with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. As an impact it is known to affect integrity. CVE summarizes:

Astro is a web framework for content-driven websites. In versions 8.1.0 through 11.0.1, when trailingSlash: 'always' is configured, the @astrojs/node standalone server's static file handler appends a trailing slash to request paths and issues a 301 redirect. Paths beginning with /\ (slash-backslash) were not recognized as internal paths, so the handler would echo the raw path back in the Location header. Because browsers treat \ as / per the WHATWG URL specification, the resulting redirect could resolve to an external host. Preconditions for exploitation: trailingSlash: 'always' must be set (non-default; the default is 'ignore'), the request path must not have a file extension in its final segment, and an attacker must deliver the crafted link to a user. This issue has been fixed in version 11.0.2.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-59730 since 07/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1204.001.

Upgrading to version 11.0.2 eliminates this vulnerability.

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Productinfo

Vendor

• withastro

Name

• astro

Version

• 11.0.0
• 11.0.1

Website

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

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