Description

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.

Mitigation

Aliases

References