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CVE-2026-54299

7.5 high SSVC exploitation: none Analyzed
NVD · CVE.org

Astro is a web framework. Prior to 6.4.6, Astro SSR apps with prerendered error pages (/404 or /500 using export const prerender = true) fetch those pages over HTTP at runtime when an error occurs. The URL for this fetch is derived from request.url, which in turn gets its origin from the incoming Host header. When the Host header is not validated against allowedDomains, an attacker can point the fetch at an arbitrary host and read the response. This vulnerability is fixed in 6.4.6.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.5 · astroNVD modified 2026-10-25 23:10

Affected (CPE criteria) 1

  • cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:*

References 1