withastro Astro up to 11.1.2 @astrojs/node adapter resource consumption

Summaryinfo

A vulnerability, which was classified as problematic, has been found in withastro Astro up to 11.1.2. The impacted element is an unknown function of the component @astrojs/node adapter. The manipulation leads to resource consumption. This vulnerability is listed as CVE-2026-102984. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in withastro Astro up to 11.1.2 and classified as problematic. This issue affects an unknown functionality of the component @astrojs/node adapter. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is:

Astro is a web framework for content-driven websites. Prior to 11.1.3, the @astrojs/node adapter builds a request URL from the Host header, and a malformed port can make that URL invalid. The recovery path reuses the same malformed host and throws an uncaught TypeError: Invalid URL before routing begins. In the default standalone configuration, the request returns an HTTP 500 response and the server continues running, but when staticHeaders is enabled the synchronous handler does not catch the exception and the Node process terminates. Proxies and CDNs that reject malformed Host headers prevent this path from reaching the origin. The issue affects availability only and does not expose data or permit code execution. This issue is fixed in version 11.1.3.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-102984 since 09/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 11.1.3 eliminates this vulnerability.

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Productinfo

Vendor

• withastro

Name

• Astro

Version

• 11.1.0
• 11.1.1
• 11.1.2

Website

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

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