CVE-2026-33769: Astro

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Astro is a web framework. From version 2.10.10 to before version 5.18.1, this issue concerns Astro's remotePatterns path enforcement for remote URLs used by server-side fetchers such as the image optimization endpoint. The path matching logic for /* wildcards is unanchored, so a pathname that contains the allowed prefix later in the path can still match. As a result, an attacker can fetch paths outside the intended allowlisted prefix on an otherwise allowed host. This issue has been patched in version 5.18.1.

Affected products

• Astro Astro: from 2.10.10, before 5.18.1 (fixed in 5.18.1)

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