# CVE-2026-41321: @astrojs/cloudflare: SSRF via redirect following in Cloudflare image-binding-transform endpoint

> Attackers can bypass domain allowlists to force the server to fetch arbitrary URLs via redirect following, potentially accessing internal resources.

- **Severity:** Low 2.2 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 24 Apr 2026
- **Updated:** 24 Apr 2026
- **Also known as:** GHSA-88gm-j2wx-58h6

## What is CVE-2026-41321?

CVE-2026-41321 is a low-severity server-side request forgery vulnerability in withastro @astrojs/cloudflare, published on 24 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

@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.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-41321?

2 open source packages ship an affected version, including @astrojs/cloudflare.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@astrojs/cloudflare` | npm | All versions | 13.1.10 |
| `@astrojs/cloudflare` | npm | All versions | 13.1.10 |

## How do I fix CVE-2026-41321?

Upgrade @astrojs/cloudflare to 13.1.10 or later.

## Is CVE-2026-41321 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41321 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-41321 and fix it if it is affected.

What it is: CVE-2026-41321 is a low-severity server-side request forgery vulnerability in withastro @astrojs/cloudflare, published on 24 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41321 exists.

Affected packages and fixed versions:
- @astrojs/cloudflare (npm): affected all versions; fixed in 13.1.10
- @astrojs/cloudflare (npm): affected all versions; fixed in 13.1.10

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-41321/ (Markdown: https://insights.sbomify.com/CVE-2026-41321/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-41321
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41321
- OSV: https://osv.dev/vulnerability/CVE-2026-41321

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-41321/
Summaries are generated and may contain mistakes; the official description above is the record.