medium5.8
CVE-2026-53944
Ghost: Private IP filtering bypass to make server-side requests to internal services
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | ghost | >= 6.0.9, <= 6.21.0 | 6.21.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-wvp2-4qqp-4h3r
- https://github.com/TryGhost/Ghost/security/advisories/GHSA-wvp2-4qqp-4h3r
- https://nvd.nist.gov/vuln/detail/CVE-2026-53944
- https://github.com/TryGhost/Ghost/pull/26749
- https://github.com/TryGhost/Ghost/commit/9b7f2212970fade08ecbec543b405190471e38d4
- https://github.com/TryGhost/Ghost/releases/tag/v6.21.1