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CVE-2026-102984 – Denial of Service (Uncaught Exception) – Astro @astrojs/node Adapter ≤ 11.1.2

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Summary

CVE-2026-102984 is a denial-of-service vulnerability in the @astrojs/node adapter for the Astro web framework, caused by an uncaught exception when processing a malformed Host header. The flaw affects versions up to and including 11.1.2 and carries a CVSS score of 8.2 (High). Under certain configurations, exploitation can crash the entire Node.js process, taking the affected site offline.

Technical details

  • Root cause: The @astrojs/node adapter builds a request URL directly from the incoming Host header. A malformed port value (e.g., a port number that is out of range, or a header containing multiple colon-delimited port segments) produces an invalid URL.
  • Trigger condition: The adapter’s fallback/recovery logic reuses the same malformed host value and also fails, resulting in an uncaught TypeError: Invalid URL before the request reaches routing.
  • Attack vector: Network — an unauthenticated attacker can send a single HTTP request with a crafted Host header directly to the origin server; no authentication or user interaction is required.
  • Impact: In the default standalone configuration, the malformed request results in an HTTP 500 response and the server continues to run. However, when the adapter is configured with staticHeaders: true, the exception is not caught by the synchronous handler and the Node.js process terminates, causing a full denial of service until the process is restarted.
  • Mitigating factor: Reverse proxies or CDNs that reject malformed Host headers before forwarding traffic to the origin prevent this request from reaching the vulnerable code path.
  • This issue affects availability only; it does not permit code execution, data exposure, or data modification.

Affected software

  • @astrojs/node adapter versions up to and including 11.1.2
  • Fixed in @astrojs/node version 11.1.3

Severity

  • CVSS Score: 8.2 (High)
  • Attack Vector: Network

Mitigation and recommended actions

  • Immediate: Upgrade @astrojs/node to version 11.1.3 or later, which fixes the URL-parsing failure.
  • If patching is not immediately possible: Deploy the affected application behind a reverse proxy, load balancer, or CDN configured to reject requests containing malformed or non-standard Host headers before they reach the origin server. Review whether staticHeaders: true is enabled, as this configuration is the one confirmed to result in full process termination rather than a recoverable 500 error.

References

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