CVE-2026-4249: Denial of Service via Malicious JSON Payloads in Throttling Events in Multiple WSO2 Products Causing Persistent Service Disruption
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-4249?
CVE-2026-4249 has a high severity rating of 8.6.
How do I fix CVE-2026-4249?
To fix CVE-2026-4249, ensure you are using the latest patched version of affected WSO2 products.
What products are affected by CVE-2026-4249?
CVE-2026-4249 affects multiple WSO2 products, primarily the WSO2 API Gateway.
What type of attack does CVE-2026-4249 enable?
CVE-2026-4249 enables an unauthenticated remote attacker to achieve a persistent denial of service condition.
What is the main cause of CVE-2026-4249?
The main cause of CVE-2026-4249 is the inadequate validation of user-supplied JSON payloads in throttling event handling.