CVE-2026-33768: Astro @astrojs/vercel

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

Astro is a web framework. Prior to version 10.0.2, the @astrojs/vercel serverless entrypoint reads the x-astro-path header and x_astro_path query parameter to rewrite the internal request path, with no authentication whatsoever. On deployments without Edge Middleware, this lets anyone bypass Vercel's platform-level path restrictions entirely. The override preserves the original HTTP method and body, so this isn't limited to GET. POST, PUT, DELETE all land on the rewritten path. A Firewall rule blocking /admin/* does nothing when the request comes in as POST /api/health?x_astro_path=/admin/delete-user. This issue has been patched in version 10.0.2.

Affected products

• Astro @astrojs/vercel: before 10.0.2 (fixed in 10.0.2)

Published 2026-03-24. Last modified 2026-06-17.