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CVE-2026-4249

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

Published: Jul 6, 2026Updated: Jul 9, 2026 Sources: CVE List NVDCWE-707
8.6HIGH
NVD MITRE
EPSS Score
0.3%
Top 73.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-707

Affected Products

WSO2
commercial·IN
WSO2 Universal GatewayOn-premSecurity Product
Security Products / secure-gateway-vpn
WSO2 Traffic ManagerOn-premNetwork Device
Networking Infrastructure / load-balancer-proxy
WSO2 API Control PlaneOn-premWeb App
Cloud & SaaS / api-gateway
WSO2 API ManagerOn-prem
Cloud & SaaS / api-gateway
api control planeSaaSSaaS Service
Cloud & SaaS / api-gateway
api managerSaaSWeb App
Cloud & SaaS / api-gateway
traffic managerSaaSWeb App
Cloud & SaaS
universal gatewaySaaSSaaS Service
Cloud & SaaS / api-gateway

Exploitability

Official Patch Available
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References

https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5236/
security.docs.wso2.com

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