CVE-2026-4249 json
Denial of Service via Malicious JSON Payloads in Throttling Events in Multiple WSO2 Products Causing Persistent Service Disruption
published 2026-07-06 4 mo ago modified 2026-07-09 4 mo ago also EUVD-2026-41871
- cvss
- 8.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 46%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- WSO2 WSO2 Universal Gateway 4.5.0.54, 4.6.0.18, 4.7.0.2
- WSO2 WSO2 Traffic Manager 4.5.0.53, 4.6.0.18, 4.7.0.2
- WSO2 WSO2 API Control Plane 4.5.0.55, 4.6.0.19, 4.7.0.2
- WSO2 WSO2 API Manager 3.2.0.470, 3.2.1.89, 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, 4.7.0.2
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
Affected products
- WSO2 WSO2 Universal Gateway
- WSO2 WSO2 Traffic Manager
- WSO2 WSO2 API Control Plane
- WSO2 WSO2 API Manager
Classification
- Weakness
-
- CWE-707 Improper Neutralization
References
Sources
- CVE List CVE-2026-4249
- NVD CVE-2026-4249
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.