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GHSA-WVMP-6R4V-J6CV

Vulnerability from github – Published: 2026-07-16 20:09 – Updated: 2026-07-16 20:09
VLAI
Summary
kuma-dp connects to control plane without verifying TLS certificate when no CA is configured
Details

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
Severity
5.8 (Medium)
CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/kumahq/kuma/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.7.26"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/kumahq/kuma/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.8.0"
            },
            {
              "fixed": "2.9.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/kumahq/kuma/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.10.0"
            },
            {
              "fixed": "2.11.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/kumahq/kuma/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.12.0"
            },
            {
              "fixed": "2.12.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/kumahq/kuma/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.13.0"
            },
            {
              "fixed": "2.13.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/kumahq/kuma"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.8.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-52724"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-16T20:09:12Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "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\n\n## Impact\n\nAn 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\n\n## Affected configurations\n\n- Universal mode `kuma-dp` started against an HTTPS control plane without `--ca-cert-file` (or `KUMA_CONTROL_PLANE_CA_CERT` unset)\n\n## Not affected\n\n- Kubernetes installs done through the standard installers (`kumactl install control-plane` or the official Helm chart). In both cases the control plane\u0027s 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\n\n## Workarounds\n\nSet `--ca-cert-file` (or `KUMA_CONTROL_PLANE_CA_CERT`) on every Universal mode data plane and point it at the control plane\u0027s 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\n\n## Resources\n\n- Fix: https://github.com/kumahq/kuma/pull/16777",
  "id": "GHSA-wvmp-6r4v-j6cv",
  "modified": "2026-07-16T20:09:12Z",
  "published": "2026-07-16T20:09:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/security/advisories/GHSA-wvmp-6r4v-j6cv"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/16777"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/commit/2ecadac1aa2fd8cded4c2ab768949f4c2ec83e2a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/kumahq/kuma"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "kuma-dp connects to control plane without verifying TLS certificate when no CA is configured"
}



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