CVE-2026-54299
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Astro
PublishedJun 22, 2026
First seenJun 22, 2026
How to fix
Update
- astro astro6.4.6 or later
- astro6.4.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| astro astro | v < 6.4.6 | 6.4.6 |
| astronpm | v < 6.4.6 | 6.4.6 |
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