Vulnerability · Published Aug 12, 2026 · Assigned by Kong
CVE-2026-18678Kong Mesh: kumactl connects to the control plane without verifying the TLS certificate when no CA is configured
Medium 5.5
In plain English
A medium-severity improper certificate validation in Kong Mesh from Kong Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
When an operator adds an HTTPS control plane profile to kumactl without providing a CA certificate, kumactl disables TLS verification and sends API tokens over the unverified connection. An attacker on the network path between the operator and the control plane can intercept user or admin API tokens and then act against the control plane as that user.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/kumahq/kuma | no fix listed | GO-2026-6010 |
| Go | github.com/kumahq/kuma | no fix listed | GHSA-v95x-xhq5-4929 |
| Go | github.com/kumahq/kuma/v2 | 2.11.14 | GHSA-v95x-xhq5-4929 |
| Go | github.com/kumahq/kuma/v2 | 2.12.11 | GHSA-v95x-xhq5-4929 |
| Go | github.com/kumahq/kuma/v2 | 2.13.7 | GHSA-v95x-xhq5-4929 |
| Go | github.com/kumahq/kuma/v2 | 2.7.26 | GHSA-v95x-xhq5-4929 |
| Go | github.com/kumahq/kuma/v2 | 2.11.14, 2.12.11, 2.13.7, 2.7.26 | GO-2026-6010 |
| Go | github.com/kumahq/kuma/v2 | 2.9.16 | GHSA-v95x-xhq5-4929 |
Affected products (as reported)
Weakness: CWE-295 · Vector: CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
References
- Upstream advisory GHSA-v95x-xhq5-4929 vendor-advisory
- kumahq/kuma#16777 (master) patch
- Kong MESH Changelog release-notes