JWT Signature Verification Vulnerability in Kong API Gateway Components
CVE-2026-14916

7.7HIGH

Key Information:

Vendor

Kong

Status
Kong Enteprise Gateway
Vendor
CVE Published:
16 September 2026

What is CVE-2026-14916?

A vulnerability in Kong API Gateway components could allow unauthenticated remote attackers to exploit improper validation of JWT signatures. This flaw impacts components responsible for JWT validation in MCP OAuth2 or DataKit integrations, where the algorithm used for JWT signing may not align with the key type employed for verification. Consequently, attackers could forge JWTs that bypass authentication measures, potentially compromising the confidentiality, integrity, and availability of services within the application.

Affected Version(s)

Kong Enteprise Gateway Linux 3.15.0.0 < 3.15.0.3

Kong Enteprise Gateway Linux 3.14.0.0 < 3.14.0.12

Kong Enteprise Gateway Linux 3.13.0.0 < 3.13.0.9

References

https://developer.konghq.com/gateway/changelog/
release-notes

CVSS V4

Score:
7.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.