CVE-2026-14916: Software Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-5qvf-77w7-x85r
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CWE-241
Published
Advisory Summary

CVE-2026-14916 is a HIGH security vulnerability vulnerability (CWE-241: Improper Handling of Unexpected Data Type) affecting Software libraries in the Maven ecosystem. The weakness occurs when the product does not handle or incorrectly handles when a particular element is not the expected type, e.g. it expects a digit (0-9) but is provided with a letter (a-z).. Remediation is available in the latest vendor maintenance releases.

CVE-2026-14916 at a Glance

CVE Identifier CVE-2026-14916
GHSA Identifier GHSA-5qvf-77w7-x85r
Severity HIGH
CVSS v3.1 Base Score N/A
CWE Classification CWE-241: Improper Handling of Unexpected Data Type
Affected Product Software
Package Ecosystem Maven
Published Date
Last Updated

How to Fix CVE-2026-14916

To remediate this vulnerability, upgrade all affected Software dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-14916, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree

Analyze the terminal output to locate any version of Software in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The mvn dependency:tree command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-241: Improper Handling of Unexpected Data Type, where the product does not handle or incorrectly handles when a particular element is not the expected type, e.g. it expects a digit (0-9) but is provided with a letter (a-z). In Software, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A 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.

References

NVD — CVE-2026-14916 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-14916
developer.konghq.com/gateway/changelog WEB
https://developer.konghq.com/gateway/changelog

Frequently Asked Questions

What is CVE-2026-14916?
CVE-2026-14916 is a security vulnerability in Software classified as a security vulnerability vulnerability under CWE-241: Improper Handling of Unexpected Data Type.
Which Software versions are affected?
Affected versions include releases prior to current release patches.
What version fixes CVE-2026-14916?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
What CWE is associated with CVE-2026-14916?
CVE-2026-14916 is classified under CWE-241: Improper Handling of Unexpected Data Type (The product does not handle or incorrectly handles when a particular element is not the expected type, e.g. it expects a digit (0-9) but is provided with a letter (A-Z).).
How can I check Maven dependencies for CVE-2026-14916?
Run the dependency tree command: 'mvn dependency:tree'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-5qvf-77w7-x85r",
  "modified" : "2026-09-16T12:30:34Z",
  "published" : "2026-09-16T12:30:34Z",
  "aliases" : [ "CVE-2026-14916" ],
  "details" : "A 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.\n\n\n\nAs 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.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "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"
  } ],
  "affected" : [ ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-14916"
  }, {
    "type" : "WEB",
    "url" : "https://developer.konghq.com/gateway/changelog"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-241" ],
    "severity" : "HIGH",
    "github_reviewed" : false,
    "github_reviewed_at" : null,
    "nvd_published_at" : "2026-09-16T11:16:40Z"
  }
}