CVE-2026-53944: Ghost: Private IP filtering bypass to make server-side requests to internal services
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.
References
- github.com/TryGhost/Ghost/commit/9b7f2212970fade08ecbec543b405190471e38d4
- github.com/TryGhost/Ghost/pull/26749
- github.com/TryGhost/Ghost/releases/tag/v6.21.1
- github.com/TryGhost/Ghost/security/advisories/GHSA-wvp2-4qqp-4h3r
- github.com/advisories/GHSA-wvp2-4qqp-4h3r
- nvd.nist.gov/vuln/detail/CVE-2026-53944
Code Behaviors & Features
Detect and mitigate CVE-2026-53944 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →