CVE-2026-41321: Withastro @astrojs/cloudflare

Low severity, CVSS 2.2. EPSS: 0.3% chance of exploitation in the next 30 days.

@astrojs/cloudflare is an SSR adapter for use with Cloudflare Workers targets. Prior to 13.1.10, the fetch() call for remote images in packages/integrations/cloudflare/src/utils/image-binding-transform.ts uses the default redirect: 'follow' behavior. This allows the Cloudflare Worker to follow HTTP redirects to arbitrary URLs, bypassing the isRemoteAllowed() domain allowlist check which only validates the initial URL. This vulnerabiity is caused by an incomplete fix for CVE-2025-58179. This vulnerability is fixed in 13.1.10.

Affected products

• Withastro @astrojs/cloudflare: before 13.1.10 (fixed in 13.1.10)

Published 2026-04-24. Last modified 2026-06-17.