Kong API Gateway Enterprise: JWT Algorithm-Confusion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-14916
StatePUBLISHED
AssignerKong
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:16:40 UTC
Updated2026-09-18 19:07:38 UTC
DescriptionA JWT signature verification vulnerability affects Kong components that perform JWT validation for MCP OAuth2 or DataKit integrations inside Kong API Gateway Enterprise. The affected code does not properly validate that the JWT signing algorithm is compatible with the type of key used for verification. As a result, an unauthenticated remote attacker may be able to craft a forged JWT that is incorrectly accepted as valid, leading to authentication bypass and potential compromise of confidentiality, integrity, and availability.

Risk And Classification

Primary CVSS: v4.0 7.7 HIGH from 02762ae7-200e-4b20-9b2b-a77d5b8fc4cb

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.006680000 probability, percentile 0.500800000 (date 2026-09-21)

Problem Types: CWE-241 | CWE-241 CWE-241 Improper handling of unexpected data type

VersionSourceTypeScoreSeverityVector
4.002762ae7-200e-4b20-9b2b-a77d5b8fc4cbSecondary7.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/C...
4.0CNACVSS7.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
High
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Kong Kong Enteprise Gateway affected 3.15.0.0 3.15.0.3 custom Linux
CNA Kong Kong Enteprise Gateway affected 3.14.0.0 3.14.0.12 custom Linux
CNA Kong Kong Enteprise Gateway affected 3.13.0.0 3.13.0.9 custom Linux
CNA Kong Kong Enteprise Gateway affected 3.12.0.0 3.12.0.10 custom Linux
CNA Kong Kong Enteprise Gateway affected 3.10.0.0 3.10.0.17 custom Linux
CNA Kong Kong Enteprise Gateway affected 3.4.0.0 3.4.3.29 custom Linux

References

ReferenceSourceLinkTags
developer.konghq.com/gateway/changelog 02762ae7-200e-4b20-9b2b-a77d5b8fc4cb developer.konghq.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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