CVE-2026-18678

Kong Mesh: kumactl connects to the control plane without verifying the TLS certificate when no CA is configured

State: Published
Severity: 5.5 Medium
Published: Aug 12, 2026
Updated: Aug 13, 2026
Reserved: Aug 3, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	5.5 Medium	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	Kong

Weaknesses

CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
Kong MeshKong Inc.	before 2.7.26Affected 2.8.0 to before 2.9.16Affected 2.10.0 to before 2.11.14Affected 2.12.0 to before 2.12.11Affected 2.13.0 to before 2.13.7Affected

References

Upstream advisory GHSA-v95x-xhq5-4929vendor-advisory
kumahq/kuma#16777 (master)patch
Kong MESH Changelogrelease-notes

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