CVE-2026-105645: Ghost: Regular Expression Denial of Service in External Media Inliner
Impact
A crafted request to the external media inliner could cause excessive CPU usage, making the Ghost server unresponsive. Exploiting this requires Administrator access.
Vulnerable versions
This vulnerability is present in Ghost from v5.37.0 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.
Other sources
Ghost is a Node.js content management system. From 5.37.0 until 6.67.0, a crafted request to the external media inliner could cause excessive CPU usage, making the Ghost server unresponsive. Exploiting this requires Administrator access. This issue is fixed in version 6.67.0.
— NVD
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/ghostto a version that resolves this vulnerability.Fixed in 6.67.0 - Upgrade
Upgrade
Ghostto a version that resolves this vulnerability.Fixed in 6.67.0
Event History
Frequently Asked Questions
Who can exploit this issue?
Exploitation requires Administrator access to Ghost. Unauthenticated users and lower-privileged accounts are not identified as able to trigger it by the available information.
Which deployments are affected?
Ghost versions from 5.37.0 through versions before 6.67.0 are affected. The issue is fixed in Ghost 6.67.0.
What is the impact of successful exploitation?
A crafted request to the external media inliner can consume excessive CPU resources and make the Ghost server unresponsive. The reported impact is availability only; no confidentiality or integrity impact is listed.