Improper Verification of Cryptographic Signature in MCP Gateway - #VU139380
Published: July 26, 2026
Vulnerability identifier: #VU139380
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-347
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to improper verification of cryptographic signature in image signature verification in pull.go when processing server definitions that reference container images. A remote attacker can supply a server definition referencing an attacker-influenced image to execute arbitrary code.
User interaction is required to load a server definition from an external catalog, registry, or shared profile.
Affected software
MCP Gateway
Remediation
Install security update from vendor's website.
MCP Gateway - update to 0.43.1