Summary
Ghost: Regular Expression Denial of Service in Content Import
Advisory details
Impact
A crafted content import file could cause excessive CPU usage, making the Ghost server unresponsive. Exploiting this requires Administrator access.
Vulnerable versions
This vulnerability is present in Ghost from v4.0.0 up to v6.65.0.
Patches
v6.67.0 contains a fix for this issue.
How to update
For self-hosters using Docker, find Docker's official Ghost image here. Updating a Docker-based Ghost instance is documented here.
If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here.
References
Ghost thanks ka3n1x for disclosing this vulnerability responsibly.
For more information
If you have any questions or comments about this advisory, email us at security@ghost.org.
References
- https://github.com/advisories/GHSA-fwh9-qg68-vxp4
- https://github.com/TryGhost/Ghost/security/advisories/GHSA-fwh9-qg68-vxp4
- https://nvd.nist.gov/vuln/detail/CVE-2026-105646
- https://github.com/TryGhost/Ghost/pull/31058
- https://github.com/TryGhost/Ghost/commit/88ae6d6d56f8a239cb38a8c89de02f034f50e2ce
- https://github.com/TryGhost/Ghost/releases/tag/v6.66.0
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