CVE-2026-73424: Withastro Astro

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Astro is a web framework for content-driven websites. From 10.0.3 until 11.0.3, the Astro Vercel adapter in packages/integrations/vercel/src/serverless/entrypoint.ts accepts x_astro_path for the public /_isr function based only on the x-vercel-isr header, allowing unauthenticated GET requests to render routes protected only by Vercel edge path rules or split edge middleware. This issue is fixed in 11.0.3.

Affected products

• Withastro Astro: from 10.0.3, before 11.0.3 (fixed in 11.0.3)

Published 2026-08-17. Last modified 2026-09-09.