Servers and applications
GHSA-299g-j426-ff48
Denial of Service via Async Helper ID in Theme Data
- Severity
- Medium 6.5
- Published
- 13 Nov 2026
- Last changed
- 13 Nov 2026
- Added to UpHeron
- 13 Nov 2026
- Fixed in
- 6.77.0
- Weakness
- Infinite loop (CWE-835)
- Attack
- Over the network · Needs a user account · No user action needed
- Attacker can
- Take it down
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H- Sources
- Project advisories (GitHub)
Description
Ghost renders themes with express-hbs, which contained a denial of service vulnerability (GHSA-9gg7-283r-5gm9). Rendering a page containing specific text caused the site to stop responding to all requests until Ghost was restarted, and the problem recurred whenever that page was rendered again.
A staff user with the Contributor role or higher could trigger this. On sites whose theme displays member-provided data, such as a member's name, a member could also trigger it; Ghost's default themes do not display this data.
No data is exposed or modified.
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.
Affected software
| Software | Affected versions |
|---|---|
GhostServers and applications · github:tryghost/ghost |
|
References
- GitHub Advisory Database https://github.com/advisories/GHSA-299g-j426-ff48
- github.com https://github.com/TryGhost/Ghost/security/advisories/GHSA-299g-j426-ff48