CVE-2026-18675
Medium
Description
The dataplane token validator in kuma-cp performs an unchecked Go type assertion on the JWT kid header. A token whose kid is a JSON number decodes as a float64 and triggers a runtime panic before any signature, claims, or authorization check runs. The panic terminates the entire kuma-cp process, HTTP API, the health and readiness endpoints, and xDS. Unauthenticated access to the dataplane gRPC server can trigger the crash with a malformed token A single request is a transient interruption; sustaining an outage requires repeated requests.
SeverityMedium
CVSS5.3
Exploit probability—
ProductKong Mesh
PublishedAug 12, 2026
First seenAug 12, 2026
Weakness typeCWE-248CWE-248CWE-704CWE-704
How to fix
Update
- Kong Inc. Kong Mesh2.7.29, 2.9.19, 2.11.18, 2.12.14, 2.13.10, 2.14.2 or later
Patches
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Kong Inc. Kong Mesh | v < 2.7.29, 2.8.0 ≤ v < 2.9.19, 2.10.0 ≤ v < 2.11.18, 2.12.0 ≤ v < 2.12.14, 2.13.0 ≤ v < 2.13.10, 2.14.0 ≤ v < 2.14.2 | 2.7.29, 2.9.19, 2.11.18, 2.12.14, 2.13.10, 2.14.2 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.