Loading HuntDB...

GHSA-f8mp-x433-5wpf

GitHub Security Advisory

Arbitrary remote code execution within `wrangler dev` Workers sandbox

✓ GitHub Reviewed CRITICAL Has CVE

Advisory Details

### Impact
The V8 inspector intentionally allows arbitrary code execution within the Workers sandbox for debugging. `wrangler dev` would previously start an inspector server listening on all network interfaces. This would allow an attacker on the local network to connect to the inspector and run arbitrary code. Additionally, the inspector server did not validate `Origin`/`Host` headers, granting an attacker that can trick any user on the local network into opening a malicious website the ability to run code. If `wrangler dev --remote` was being used, an attacker could access production resources if they were bound to the worker.

### Patches
This issue was fixed in `[email protected]` and `[email protected]`. Whilst `wrangler dev`'s inspector server listens on local interfaces by default as of `[email protected]`, an [SSRF vulnerability in `miniflare`](https://github.com/cloudflare/workers-sdk/security/advisories/GHSA-fwvg-2739-22v7) allowed access from the local network until `[email protected]`. `[email protected]` and `[email protected]` introduced validation for the `Origin`/`Host` headers.

### Workarounds
Unfortunately, Wrangler doesn't provide any configuration for which host that inspector server should listen on. Please upgrade to at least `[email protected]`, and configure Wrangler to listen on local interfaces instead with `wrangler dev --ip 127.0.0.1` to prevent SSRF. This removes the local network as an attack vector, but does not prevent an attack from visiting a malicious website.

### References
- https://github.com/cloudflare/workers-sdk/issues/4430
- https://github.com/cloudflare/workers-sdk/pull/4437
- https://github.com/cloudflare/workers-sdk/pull/4535
- https://github.com/cloudflare/workers-sdk/pull/4550

Affected Packages

npm wrangler
Affected versions: 3.0.0 (fixed in 3.19.0)
npm wrangler
Affected versions: 2.0.0 (fixed in 2.20.2)

Related CVEs

Key Information

GHSA ID
GHSA-f8mp-x433-5wpf
Published
January 3, 2024 9:26 PM
Last Modified
January 3, 2024 9:26 PM
CVSS Score
9.0 /10
Primary Ecosystem
npm
Primary Package
wrangler
GitHub Reviewed
✓ Yes

Dataset

Last updated: September 14, 2025 6:31 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.