CVE-2026-18679 Kong Inc. CVE debrief

Who should care

Organizations using kuma-dp with an HTTPS control plane should be aware of this vulnerability and take steps to verify their configurations and ensure proper TLS peer verification is enabled. This includes reviewing and updating control plane and data plane authentication settings, monitoring for suspicious activity related to kuma-dp and control plane communications, and ensuring that proper security measures are in place to prevent unauthorized access.

Technical summary

The CVE-2026-18679 vulnerability in kuma-dp allows an on-path actor to intercept the dataplane authentication token and impersonate the control plane when TLS peer verification is disabled. This occurs when kuma-dp is started against an HTTPS control plane without a provided CA certificate. The vulnerability impacts organizations using kuma-dp with an HTTPS control plane, as they are at risk of unauthorized access and potential security breaches.

Defensive priority

Organizations using kuma-dp with an HTTPS control plane should verify their configurations and ensure proper TLS peer verification is enabled.

Recommended defensive actions

• Verify kuma-dp configurations to ensure proper TLS peer verification is enabled
• Review and update control plane and data plane authentication settings
• Monitor for suspicious activity related to kuma-dp and control plane communications
• Perform a thorough review of the current security posture to identify potential vulnerabilities
• Implement additional security measures to prevent unauthorized access
• Conduct regular security audits to ensure compliance with security policies
• Review and update incident response plans to address potential security breaches

Evidence notes

The CVE description indicates that when kuma-dp is started against an HTTPS control plane without a provided CA certificate, the data plane connects with TLS peer verification disabled. This allows an on-path actor to intercept the dataplane authentication token and impersonate the control plane. Organizations should verify their configurations and ensure proper TLS peer verification is enabled. The NVD entry is currently Awaiting Analysis. There is no information on known or unknown affected scope beyond the provided CVE description.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.