High severity7.5GHSA Advisory· Published Jun 22, 2026· Updated Jun 23, 2026
CVE-2026-54299
CVE-2026-54299
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
astronpm | < 6.4.6 | 6.4.6 |
Affected products
3Patches
Vulnerability mechanics
References
3- github.com/advisories/GHSA-2pvr-wf23-7pc7ghsaADVISORY
- github.com/withastro/astro/security/advisories/GHSA-2pvr-wf23-7pc7nvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-54299ghsaADVISORY
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