High 8.2Published Sep 30, 2026

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

Updated under an hour ago (2026-10-19 10:00 UTC)

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It affects withastro astro. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.36%, higher than 28% of scored CVEs.

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Every CVE for withastro astro

Exploited in the last 30 days

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.

CVSS: 8.2 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-248
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.36% (percentile 28)
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Sep 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

withastro astro withastro:astro (from the name)	before 11.1.3	CNA record

References

https://github.com/withastro/astro/security/advisories/GHSA-qh8j-hqjv-7m4xx-refsource-confirm
https://github.com/withastro/astro/pull/17572x-refsource-misc
https://github.com/withastro/astro/commit/2066f39c60707a100531b4ef4bb5dab8feafa7f2x-refsource-misc
https://github.com/withastro/astro/releases/tag/@astrojs/node@11.1.3x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.