Astro: Remote allowlist bypass via unanchored matchPathname wildcard_CVE-2026-33769

2.9 / 10

LOW

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P

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.

Basic Information

ID CVE-2026-33769

Source GitHub_M

Published Mar 24, 2026 at 18:44

Modified Mar 24, 2026 at 20:13

Affected Product

Vendor withastro

Product astro

Version >= 2.10.10, < 5.18.1

Affected Versions withastro astro >= 2.10.10, < 5.18.1

CWE Classification

CWE-20

References

github.com /withastro/astro/security/advisories/GHSA-g735-7g2w-hh3f

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    "published": "2026-03-24T18:44:29.169Z",
    "modified": "2026-03-24T20:13:25.845Z",
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