CVE-2026-4249 PUBLISHED

Denial of Service via Malicious JSON Payloads in Throttling Events in Multiple WSO2 Products Causing Persistent Service Disruption

Assigner: WSO2
Reserved: 16.03.2026 Published: 06.07.2026 Updated: 06.07.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS Score: 8.6

Product Status

Vendor WSO2
Product WSO2 Universal Gateway
Versions Default: unaffected
  • affected from 4.5.0 to 4.5.0.54 (excl.)
  • affected from 4.6.0 to 4.6.0.18 (excl.)
  • affected from 4.7.0 to 4.7.0.2 (excl.)
Vendor WSO2
Product WSO2 Traffic Manager
Versions Default: unaffected
  • affected from 4.5.0 to 4.5.0.53 (excl.)
  • affected from 4.6.0 to 4.6.0.18 (excl.)
  • affected from 4.7.0 to 4.7.0.2 (excl.)
Vendor WSO2
Product WSO2 API Control Plane
Versions Default: unaffected
  • affected from 4.5.0 to 4.5.0.55 (excl.)
  • affected from 4.6.0 to 4.6.0.19 (excl.)
  • affected from 4.7.0 to 4.7.0.2 (excl.)
Vendor WSO2
Product WSO2 API Manager
Versions Default: unaffected
  • unknown from 0 to 3.2.0 (excl.)
  • affected from 3.2.0 to 3.2.0.470 (excl.)
  • affected from 3.2.1 to 3.2.1.89 (excl.)
  • affected from 4.0.0 to 4.0.0.390 (excl.)
  • affected from 4.1.0 to 4.1.0.254 (excl.)
  • affected from 4.2.0 to 4.2.0.194 (excl.)
  • affected from 4.3.0 to 4.3.0.105 (excl.)
  • affected from 4.4.0 to 4.4.0.69 (excl.)
  • affected from 4.5.0 to 4.5.0.54 (excl.)
  • affected from 4.6.0 to 4.6.0.18 (excl.)
  • affected from 4.7.0 to 4.7.0.2 (excl.)

Solutions

Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5236/#solution

References

Problem Types

  • CWE-707: Use of Out-of-Scope Validation CWE

Impacts

  • CAPEC-10 CAPEC-10: Denial of Service