PatchTheCVECVE-2026-54299: Astro is a web framework
CVE-2026-54299 is a high-severity flaw (CVSS 7.5) affecting astro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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. T
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-54299?
astro: upgrade to 6.4.6. Exact commands for each OS are on this page.
Is CVE-2026-54299 being exploited?
CVE-2026-54299 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-54299 affect?
CVE-2026-54299 affects astro. Severity is high (CVSS 7.5). 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 req
How urgent is CVE-2026-54299?
Priority 38/100. High severity; Remotely exploitable, no login, no user action
Related CVEs
- CVE-2026-50146 HIGH 7.1 UPGRADE Astro is a web framework
- CVE-2026-54298 MEDIUM 4.2 UPGRADE Astro is a web framework