Improper Handling of Case Sensitivity in MCP Gateway - #VU164386
Published: November 10, 2026
Vulnerability identifier: #VU164386
CSH Severity: Medium
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-178
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to receive arguments intended for built-in Docker MCP Gateway control-plane tools.
The vulnerability exists due to improper handling of case sensitivity in validateToolNameCollisions and isToolEnabled when checking tool-name collisions and allowlist entries. A remote attacker can expose a case variant of a reserved tool name through an operator-enabled, attacker-controlled MCP server to intercept arguments when a connected client selects the look-alike tool.
Affected software
MCP Gateway
Remediation
Install security update from vendor's website.
MCP Gateway - update to 0.44.1