CVE-2026-4249
Denial of Service via Malicious JSON Payloads in Throttling Events in Multiple WSO2 Products Causing Persistent Service Disruption
CVSS Score
8.6
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-707 |
| Vendor | wso2 |
| Product | wso2 universal gateway |
| Published | Jul 6, 2026 |
| Last Updated | Jul 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
WSO2 / WSO2 Universal Gateway
4.5.0 < 4.5.0.54 4.6.0 < 4.6.0.18 4.7.0 < 4.7.0.2
WSO2 / WSO2 Traffic Manager
4.5.0 < 4.5.0.53 4.6.0 < 4.6.0.18 4.7.0 < 4.7.0.2
WSO2 / WSO2 API Control Plane
4.5.0 < 4.5.0.55 4.6.0 < 4.6.0.19 4.7.0 < 4.7.0.2
WSO2 / WSO2 API Manager
3.2.0 < 3.2.0.470 3.2.1 < 3.2.1.89 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 4.7.0 < 4.7.0.2