CVE-2026-18675
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 5.3
- CVSS vector
- CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- EPSS probability
- 0.38%
- CWE
- CWE-248, CWE-704
- Published
- 2026-08-12
- Last modified
- 2026-08-13
Affected products
- Kong Inc. Kong Mesh
- Kong Inc. Kong Mesh
- Kong Inc. Kong Mesh
- Kong Inc. Kong Mesh
- Kong Inc. Kong Mesh
- Kong Inc. Kong Mesh
Weakness type
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