kuma-dp connects to control plane without verifying TLS certificate when no CA is configured
Kuma is a modern Envoy-based service mesh that can run on every cloud across both Kubernetes and VMs. Prior to 2.7.26, 2.9.16, 2.11.14, 2.12.11, and 2.13.7, Universal mode kuma-dp connections to an HTTPS control plane disable TLS peer verification when --ca-cert-file is not supplied and KUMA_CONTROL_PLANE_CA_CERT is unset. The dataplane authentication token is sent over the unverified connection, allowing an on-path attacker to intercept the token, impersonate the control plane, inject a forged bootstrap configuration, and take over the proxy. Standard Kubernetes installations created by kumactl install control-plane or the official Helm chart are unaffected because the mutating admission webhook injects KUMA_CONTROL_PLANE_CA_CERT into each sidecar. This issue is fixed in versions 2.7.26, 2.9.16, 2.11.14, 2.12.11, and 2.13.7.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-18679US | — | — | ||
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 dataplan… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52724.jsonADVISORY
- https://github.com/kumahq/kuma/commit/2d0fb382924598f8746bc85c896f50384675940fFIX
- https://github.com/kumahq/kuma/commit/85716397ffa404234bf365da0967eca0b0fa1870FIX
- https://github.com/kumahq/kuma/commit/a256af4869ae7e0ebbc2a14dc231e04ac8df1ba3FIX
- https://github.com/kumahq/kuma/commit/bb56ae628753aaec1f7846a514ab4edc35c0b569FIX
- https://github.com/kumahq/kuma/commit/d4ae0c0151596be991897651f20c5cdf32de1980FIX
- https://github.com/kumahq/kuma/commit/eb81494c2c7a5536e55c19cdde51b02a03b51e11FIX
- https://github.com/kumahq/kuma/pull/16777FIX
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