Cloudflare has SSRF via redirect following through its image-binding-transform endpoint (incomplete fix for GHSA-qpr4)

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

2.2 · CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L

EPSS

• CVE-2026-41321: 0.24% estimated exploitation activity in the next 30 days; percentile 15.50 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The fetch() call for remote images in packages/integrations/cloudflare/src/utils/image-binding-transform.ts (line 28) 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. All three other image fetch paths in the codebase correctly use { redirect: 'manual' }. This is an incomplete fix for GHSA-qpr4-c339-7vq8. Confirmed on HEAD. Root Cause image-binding-transform.ts line 28: const content = await (isRemotePath(href) ? fetch(imageSrc) : assets.fetch(imageSrc)); Missing { redirect: 'manual' }. The three protected paths: // image-passthrough-endpoint.ts:23 response = await fetch(href, { redirect: 'manual' }); // assets/endpoint/shared.ts:11 const res = await fetch(src, { redirect: 'manual' }); // assets/utils/remoteProbe.ts:53 const response = await fetch(url, { redirect: 'manual' }); PoC Demonstrated with Node.js that…

Published by the source

23 Apr 2026, 21:52 UTC

Last modified by the source

5 May 2026, 16:05 UTC

Source last checked

26 Oct 2026, 12:51 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-88gm-j2wx-58h6

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-88gm-j2wx-58h6

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# Patch Next advisory brief: CVE-2026-41321

Advisory: Cloudflare has SSRF via redirect following through its image-binding-transform endpoint (incomplete fix for GHSA-qpr4)
IDs: CVE-2026-41321, GHSA-88gm-j2wx-58h6
Record: https://patchnext.com/advisories/cve-2026-41321 (revision 2, source checked 26 Oct 2026, 12:51 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 2.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: @astrojs/cloudflare 13.1.10. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm @astrojs/cloudflare: affected < 13.1.10; fixed in 13.1.10

## Suggested inspection (read-only)
- `npm ls @astrojs/cloudflare --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on @astrojs/cloudflare.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-88gm-j2wx-58h6 (OSV record GHSA-88gm-j2wx-58h6 lists affected ranges: npm @astrojs/cloudflare >=0 <13.1.10 (fixed))
- Verified: https://github.com/advisories/GHSA-88gm-j2wx-58h6 (GitHub-reviewed advisory GHSA-88gm-j2wx-58h6 lists affected ranges: npm @astrojs/cloudflare >=0 <13.1.10)

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