CVE-2026-54299 | Astro is a web framework. Prior to 6.4.6, Astro SSR apps wit… | CVSS 7.5 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.

Metadata

CVE ID: CVE-2026-54299
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-12 17:46 UTC
Published: 2026-06-22 17:33 UTC
Last updated: 2026-06-22 17:33 UTC
Primary CWE: CWE-20
CWE-20: Improper Input Validation
Vendor / Product: withastro / astro
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

Affected products (1)

Vendor	Product	Platform	Versions
withastro	astro	—	< 6.4.6

Weakness (CWE)

CWE	Source	Description
CWE-20	cna	CWE-20: Improper Input Validation
CWE-918	cna	CWE-918: Server-Side Request Forgery (SSRF)

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N

References (1)

https://github.com/withastro/astro/security/advisories/GHSA-2pvr-wf23-7pc7 https://github.com/withastro/astro/security/advisories/GHSA-2pvr-wf23-7pc7