What is CVE-2026-54299?

CVE-2026-54299 is a high-severity vulnerability in Withastro Astro, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-06-22.

How severe is CVE-2026-54299?

High severity. CVSS v3 base score is 7.5 out of 10.

SSRF in Withastro Astro

CVE-2026-54299

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 re…

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N.

Affected products

Withastro Astro — versions < 6.4.6

Weakness classification (CWE)

CWE-20 — Improper Input Validation
CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-54299?: CVE-2026-54299 is a high-severity vulnerability in Withastro Astro, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2026-06-22.
How severe is CVE-2026-54299?: High severity. CVSS v3 base score is 7.5 out of 10.