CVE-2026-18679: kuma-dp connects to control plane without verifying TLS certificate when no CA is configured

CVE-2026-18679 · Severity: medium · CVSS 4 · Published 2026-08-12

When kuma-dp is started against an HTTPS control plane and the operator did not pass a CA certificate, the data plane connects with TLS peer verification disabled, and the dataplane authentication token is sent over that unverified connection.

An on-path actor can intercept the dataplane authentication token and impersonate the control plane to the data plane, injecting a forged bootstrap configuration and taking over the proxy.

Technologies: github.com/kumahq/kuma (Go), github.com/kumahq/kuma/v2 (Go). Vendors: Go.

Quick answers

Is CVE-2026-18679 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-18679 being exploited in the wild.
How severe is CVE-2026-18679?
Medium severity, with a CVSS score of 4, published 12 August 2026.
Which products and versions are affected?
github.com/kumahq/kuma (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=1.8.1; github.com/kumahq/kuma/v2 (Go) SEMVER:introduced=0,fixed=2.7.26, SEMVER:introduced=0,fixed=2.7.26,introduced=2.9.13,fixed=2.11.14,introduced=2.12.4,fixed=2.12.11,introduced=2.13.0,fixed=2.13.7.
Is there a fix for CVE-2026-18679?
Yes. github.com/kumahq/kuma/v2 (Go): upgrade to 2.13.7, 2.7.26 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-18679?
Check whether you run github.com/kumahq/kuma (Go) or github.com/kumahq/kuma/v2 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/kumahq/kuma/v2 (Go): upgrade to 2.13.7, 2.7.26 or later
    go get github.com/kumahq/kuma/v2@v2.13.7

Affected products

  • github.com/kumahq/kuma (Go) SEMVER:introduced=0, SEMVER:introduced=0,last_affected=1.8.1
  • github.com/kumahq/kuma/v2 (Go) SEMVER:introduced=0,fixed=2.7.26, SEMVER:introduced=0,fixed=2.7.26,introduced=2.9.13,fixed=2.11.14,introduced=2.12.4,fixed=2.12.11,introduced=2.13.0,fixed=2.13.7

Identifiers

  • CVE-2026-18679
  • CVE-2026-52724
  • GHSA-wvmp-6r4v-j6cv
  • GO-2026-6013

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