# CVE-2026-18675

## Summary

- **CVE ID:** CVE-2026-18675
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (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)
- **CWE:** CWE-248, CWE-704
- **Published:** Aug 12, 2026
- **Last Modified:** Aug 13, 2026

## 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.

## Affected Products

- Kong Inc. — Kong Mesh (0)
- Kong Inc. — Kong Mesh (2.8.0)
- Kong Inc. — Kong Mesh (2.10.0)
- Kong Inc. — Kong Mesh (2.12.0)
- Kong Inc. — Kong Mesh (2.13.0)
- Kong Inc. — Kong Mesh (2.14.0)

## References

- [CNA](https://github.com/kumahq/kuma/security/advisories/GHSA-5mxq-7xq4-3vx8)
- [CNA](https://github.com/kumahq/kuma/pull/17465)
- [CNA](https://github.com/kumahq/kuma/pull/17468)
- [CNA](https://github.com/kumahq/kuma/pull/17467)
- [CNA](https://github.com/kumahq/kuma/pull/17471)
- [CNA](https://github.com/kumahq/kuma/pull/17469)
- [CNA](https://github.com/kumahq/kuma/pull/17470)
- [CNA](https://github.com/kumahq/kuma/pull/17472)
- [CNA](https://developer.konghq.com/mesh/changelog/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.38%
- **EPSS Percentile:** 31.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-12._