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Vulnerabilities

Vulnerability · CVE-2026-105648

Private IP Filtering Bypass via IPv6 Transition Addresses

Published Sep 24, 2026 · catalog updated Oct 5, 2026 · Private IP Filtering Bypass

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-105648. EPSS is 0.30%. Act only if a listed version of Private IP Filtering Bypass is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Private IP Filtering Bypass).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium4.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.30%
Remediation
Version ranges on file
Affected products
npm ghost

### 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](https://hub.docker.com/_/ghost). Updating a Docker-based Ghost instance [is documented here](https://docs.ghost.org/install/docker#updating-ghost). If your Ghost is a Ghost-CLI install see our documentation on [updating it to the latest version here](https://docs.ghost.org/update). ### References We thank [Nhat Anh Vu](https://github.com/nhattanhh) 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).

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm ghost>= 6.0.9, < 6.65.0

How to fix CVE-2026-105648

  • Upgrade

    CVE-2026-105648 lists a fix boundary at 6.65.0. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 6.65.0

  • Advisory

    Open the inventory_github record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-105648. EPSS is 0.30%. Act only if a listed version of Private IP Filtering Bypass is installed.

Which versions are affected?

Compare what you have installed with >= 6.0.9, < 6.65.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-184; CWE-918: Server-Side Request Forgery (SSRF). EPSS 0.30%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ghost security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 24, 2026 · Maintainer security tabs

    Detected

    ### 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. ### Pat

  2. Oct 5, 2026 · Maintainer security tabs

    Updated

    ### 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. ### Pat

Sources

  • Maintainer security tabsVendor advisoryGHSA-r7f2-6fj8-6fg2

    ### 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. ### Pat

    github.com

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Maintainer security tabsNov 1, 2026