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GHSA-wvmp-6r4v-j6cv

MediumCVSS 5.8 / 10
Published Jul 16, 2026·Last modified Jul 16, 2026
Affected Components(0)

No affected components available

Description

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. The dataplane authentication token is sent over this unverified connection

Impact

An on-path attacker can intercept the dataplane authentication token and impersonate the control plane to the data plane, allowing them to inject a forged bootstrap configuration and take over the proxy

Affected configurations

  • Universal mode kuma-dp started against an HTTPS control plane without --ca-cert-file (or KUMA_CONTROL_PLANE_CA_CERT unset)

Not affected

  • Kubernetes installs done through the standard installers (kumactl install control-plane or the official Helm chart). In both cases the control plane's mutating admission webhook injects KUMA_CONTROL_PLANE_CA_CERT into every sidecar at pod admission, so each kuma-dp starts with the CA already configured

Workarounds

Set --ca-cert-file (or KUMA_CONTROL_PLANE_CA_CERT) on every Universal mode data plane and point it 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
Risk Scores
Base Score
5.8

The vulnerability can be exploited over a local network, such as Wi-Fi. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.

Threat Intelligence
1.5

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-52724
    Alias

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Medium severity
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