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CVE-2026-105648BIT-ghost-2026-105648GHSA-r7f2-6fj8-6fg2

Ghost: Private IP Filtering Bypass via IPv6 Transition Addresses

TryGhost ghostnpmApplications & CMS
Open in ThreatlineRecord JSON
CVSS
4.0Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.30%Chance of exploitation activity in the next 30 days, higher than 21% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6.65.0Fixed versionGitHub
Published5 Oct 2026Updated 13 Oct 2026CVE List

What fixes it

  • 6.65.0ghost, npmGitHubnpm install ghost@6.65.0

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

Impact

A validation issue allowed some functionality, such as Webmentions, to be abused by an unauthenticated user to make limited HTTP requests to hosts in the Ghost server's internal network on some network configurations. A successful attack would not result in any response data being returned.

Vulnerable versions

This vulnerability is present in Ghost from v6.0.9 up to v6.64.0.

Patches

v6.65.0 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 Nhat Anh Vu for disclosing this vulnerability responsibly.

For more information

If you have any questions or comments about this advisory, email us at [security@ghost.org](mailto:security@ghost.org).

Text from GitHub Advisory Database

Affected versions 3

  • ghost, npm>= 6.0.9, < 6.65.0GitHub
  • Ghostaffected: >= 6.0.9, < 6.65.0CVE List
  • ghost, npmfrom 6.0.9, fixed in 6.65.0OSV

References 6