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BIT-ghost-2026-53944 — Ghost: Private IP filtering bypass to make server-side requests to internal services

2026-10-08T21:44:20.218713+00:00

Affected: Bitnami: ghost

Ghost is a Node.js content management system. From 6.0.9 until 6.21.1, when making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address. This vulnerability is fixed in 6.21.1.

EUVD-2026-330022

2026-10-08T21:44:20.218772+00:00

EUVD-2026-330022

fkie_cve-2026-53944

2026-10-08T21:44:20.218788+00:00

GHSA-wvp2-4qqp-4h3r — Ghost: Private IP filtering bypass to make server-side requests to internal services

2026-10-08T21:44:20.218812+00:00

Affected: npm: ghost

### Impact

When making an external request, it is possible to bypass the IP filter that ensures the request isn't going to an internal service using an IPv6 literal which maps to a private IPv4 address.

### Vulnerable versions

This vulnerability is present in Ghost from v6.0.9 up to v6.21.0.

### Patches

v6.21.1 contains a fix for this issue.

### How to update

For self-hosters using Docker, find [Docker's official Ghost image here](https://hub.docker.com/_/ghost). Updating a Docker-based Ghost instance [is documented here](https://docs.ghost.org/install/docker#updating-ghost).

If your Ghost is a Ghost-CLI install see our documentation on [updating it to the latest version here](https://docs.ghost.org/update).

### References

Ghost thanks [l3tchupkt](http://github.com/l3tchupkt) for disclosing this vulnerability responsibly.

### For more information

If you have any questions or comments about this advisory, email us at [security@ghost.org](mailto:security@ghost.org).