CVE-2026-4249

Vulnerability overview

The throttling event handling mechanism in multiple WSO2 products accepts user-supplied JSON payloads without sufficient validation of their structure and content. This allows an unauthenticated remote attacker to inject malicious JSON data that can lead to a persistent denial of service condition. Successful exploitation of this vulnerability can disrupt the API Gateway, preventing legitimate API traffic from being processed and impacting complete service availability. The denial of service is persistent, requiring manual intervention to restore normal operations.

Affected product and versions

Product

WSO2 WSO2 Universal Gateway, WSO2 Traffic Manager, WSO2 API Control Plane

Affected versions

4.5.0, 4.6.0, 4.7.0, 3.2.0, 3.2.1, 4.0.0, 4.1.0, 4.2.0, 4.3.0, 4.4.0, >= 4.5.0 < 4.5.0.55, >= 4.6.0 < 4.6.0.19, >= 4.0.0 < 4.0.0.390, >= 4.1.0 < 4.1.0.254, >= 4.2.0 < 4.2.0.194, >= 4.3.0 < 4.3.0.105, >= 4.4.0 < 4.4.0.69, >= 4.5.0 < 4.5.0.54, >= 4.6.0 < 4.6.0.18, >= 4.5.0 < 4.5.0.53

Fixed versions

4.5.0.55, 4.6.0.19, 4.0.0.390, 4.1.0.254, 4.2.0.194, 4.3.0.105, 4.4.0.69, 4.5.0.54, 4.6.0.18, 4.5.0.53

Technical data

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CWE

CWE-707