withastro up to 13.1.9 HTTP Redirect image-binding-transform.ts fetch server-side request forgery

Summaryinfo

A vulnerability marked as critical has been reported in withastro astro up to 13.1.9. Affected by this issue is the function fetch of the file packages/integrations/cloudflare/src/utils/image-binding-transform.ts of the component HTTP Redirect Handler. This manipulation causes server-side request forgery. This vulnerability appears as CVE-2026-41321. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in withastro astro up to 13.1.9. It has been declared as critical. Affected by this vulnerability is the function fetch of the file packages/integrations/cloudflare/src/utils/image-binding-transform.ts of the component HTTP Redirect Handler. The manipulation with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

@astrojs/cloudflare is an SSR adapter for use with Cloudflare Workers targets. Prior to 13.1.10, the fetch() call for remote images in packages/integrations/cloudflare/src/utils/image-binding-transform.ts uses the default redirect: 'follow' behavior. This allows the Cloudflare Worker to follow HTTP redirects to arbitrary URLs, bypassing the isRemoteAllowed() domain allowlist check which only validates the initial URL. This vulnerabiity is caused by an incomplete fix for CVE-2025-58179. This vulnerability is fixed in 13.1.10.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-41321 since 04/20/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are necessary for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 13.1.10 eliminates this vulnerability.

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Productinfo

Vendor

• withastro

Name

• astro

Version

• 13.1.0
• 13.1.1
• 13.1.2
• 13.1.3
• 13.1.4
• 13.1.5
• 13.1.6
• 13.1.7
• 13.1.8
• 13.1.9

Website

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

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