CVE-2026-4249
Denial of Service via Malicious JSON Payloads in Throttling Events in Multiple WSO2 Products Causing Persistent Service Disruption
- 8.6HighCVSS base score
- 0.56%Exploitation in 30 daysEPSS · top 53% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By WSO2
- 4 months later
· 4 months later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| WSO2CNA (assigner) | 3.1 | High8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.56% · top 53% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.
Affected products
- affected 4.5.0 – < 4.5.0.54
- affected 4.6.0 – < 4.6.0.18
- affected 4.7.0 – < 4.7.0.2
- affected 4.5.0 – < 4.5.0.53
- affected 4.6.0 – < 4.6.0.18
- affected 4.7.0 – < 4.7.0.2
- affected 4.5.0 – < 4.5.0.55
- affected 4.6.0 – < 4.6.0.19
- affected 4.7.0 – < 4.7.0.2
- unknown < 3.2.0
- affected 3.2.0 – < 3.2.0.470
- affected 3.2.1 – < 3.2.1.89
- affected 4.0.0 – < 4.0.0.390
- affected 4.1.0 – < 4.1.0.254
- affected 4.2.0 – < 4.2.0.194
- affected 4.3.0 – < 4.3.0.105
- affected 4.4.0 – < 4.4.0.69
- affected 4.5.0 – < 4.5.0.54
- affected 4.6.0 – < 4.6.0.18
- affected 4.7.0 – < 4.7.0.2
What to do
Solution: Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5236/#solution
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-41871 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-4249)Record last updated .