Incomplete List of Disallowed Inputs in Ghost - CVE-2026-53944
Published: July 30, 2026
Vulnerability identifier: #VU140537
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-53944
CWE-ID: CWE-184
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to make server-side requests to internal services.
The vulnerability exists due to incomplete list of disallowed inputs in the external request IP filter when processing an IPv6 literal that maps to a private IPv4 address. A remote attacker can supply a crafted IPv6 literal to make server-side requests to internal services.
Affected software
Ghost
How to mitigate CVE-2026-53944
Install security update from vendor's website.
Ghost - update to 6.21.1