CVE-2026-102984 Astro: Malformed port in the Host header can crash the Node adapter
A malformed Host header can crash the Astro Node adapter process when staticHeaders is enabled, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-102984?
CVE-2026-102984 is a high-severity denial of service vulnerability in withastro astro, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-248
Which versions are affected by CVE-2026-102984?
2 open source packages ship an affected version, including @astrojs/node.
| Package | Affected | Fixed in |
|---|---|---|
@astrojs/node npm | All versions | 11.1.3 |
@astrojs/node npm | All versions | 11.1.3 |
How do I fix CVE-2026-102984?
Upgrade @astrojs/node to 11.1.3 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-102984 being exploited?
There is no known exploitation of CVE-2026-102984 in the wild and no public exploit code.
Sources
Also known as GHSA-qh8j-hqjv-7m4x.