---
id: CVE-2026-18678
aliases:
  - GHSA-v95x-xhq5-4929
  - CVE-2026-50166
  - GO-2026-6010
title: >-
  kumactl connects to control plane without verifying TLS certificate when no CA
  is configured
summary: >-
  kumactl connects to control plane without verifying TLS certificate when no CA
  is configured
severity: medium
vendor: kumahq
product: github.com/kumahq/kuma/v2
ecosystem: go
affected:
  - github.com/kumahq/kuma/v2 < 2.7.26
  - 'github.com/kumahq/kuma/v2 >= 2.8.0, < 2.9.16'
  - 'github.com/kumahq/kuma/v2 >= 2.10.0, < 2.11.14'
  - 'github.com/kumahq/kuma/v2 >= 2.12.0, < 2.12.11'
  - 'github.com/kumahq/kuma/v2 >= 2.13.0, < 2.13.7'
  - github.com/kumahq/kuma <= 1.8.1
patched:
  - github.com/kumahq/kuma/v2 2.7.26
  - github.com/kumahq/kuma/v2 2.9.16
  - github.com/kumahq/kuma/v2 2.11.14
  - github.com/kumahq/kuma/v2 2.12.11
  - github.com/kumahq/kuma/v2 2.13.7
published: '2026-07-16'
updated: '2026-08-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-v95x-xhq5-4929'
references:
  - url: 'https://github.com/kumahq/kuma/security/advisories/GHSA-v95x-xhq5-4929'
  - url: 'https://github.com/kumahq/kuma/pull/16777'
  - url: >-
      https://github.com/kumahq/kuma/commit/2ecadac1aa2fd8cded4c2ab768949f4c2ec83e2a
  - url: 'https://github.com/kumahq/kuma'
tags:
  - osv
  - go
epss: 0.00128
epssPercentile: 0.02038
ingestedAt: '2026-08-13T19:18:21.341Z'
---

## Overview

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

## Impact

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 configurations

- `kumactl` profiles manually added against an HTTPS control plane endpoint without `--ca-cert-file`

## Not affected

- The default local profile, which uses plain HTTP

## Workarounds

When adding an HTTPS control plane profile to `kumactl`, always pass `--ca-cert-file` pointing at the control plane's serving CA. Alternatively, terminate the control plane behind a publicly trusted certificate; the patched releases will verify successfully against the operating system trust store with no further configuration

## Resources

- Fix: https://github.com/kumahq/kuma/pull/16777

## Affected packages

- `github.com/kumahq/kuma/v2 < 2.7.26`
- `github.com/kumahq/kuma/v2 >= 2.8.0, < 2.9.16`
- `github.com/kumahq/kuma/v2 >= 2.10.0, < 2.11.14`
- `github.com/kumahq/kuma/v2 >= 2.12.0, < 2.12.11`
- `github.com/kumahq/kuma/v2 >= 2.13.0, < 2.13.7`
- `github.com/kumahq/kuma <= 1.8.1`

## Remediation

Upgrade to a patched release:

- `github.com/kumahq/kuma/v2 2.7.26`
- `github.com/kumahq/kuma/v2 2.9.16`
- `github.com/kumahq/kuma/v2 2.11.14`
- `github.com/kumahq/kuma/v2 2.12.11`
- `github.com/kumahq/kuma/v2 2.13.7`