CVE-2026-33769
Medium
Description
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Astro
PublishedMar 24, 2026
First seenMar 24, 2026
Weakness typeCWE-20Improper input validation
How to fix
Update
- astro astro5.18.1 or later
- astro5.18.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| astro astro | 2.10.10 ≤ v < 5.18.1 | 5.18.1 |
| astronpm | 2.10.10 ≤ v < 5.18.1 | 5.18.1 |
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