VULNERABILITY INTELLIGENCE

CVE-2026-54299

CVSS score7.5 HIGH
EPSS probability0.33%
CISA KEVNot currently listed
Published2026-06-22
Last modified2026-10-25
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

Description

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.

Weakness classification

  • security-advisories@github.com: CWE-20

Primary references