GHSA-7GH2-244H-962W

Vulnerability from github – Published: 2026-08-12 21:31 – Updated: 2026-08-12 21:31
VLAI
Details

The dataplane token validator in kuma-cp performs an unchecked Go type assertion on the JWT kid header. A token whose kid is a JSON number decodes as a float64 and triggers a runtime panic before any signature, claims, or authorization check runs.

The panic terminates the entire kuma-cp process, HTTP API, the health and readiness endpoints, and xDS. Unauthenticated access to the dataplane gRPC server can trigger the crash with a malformed token

A single request is a transient interruption; sustaining an outage requires repeated requests.

Severity
5.3 (Medium)
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
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{
  "affected": [],
  "aliases": [
    "CVE-2026-18675"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-248"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-12T19:17:30Z",
    "severity": "MODERATE"
  },
  "details": "The dataplane token validator in kuma-cp performs an unchecked Go type assertion on the JWT kid header. A token whose kid is a JSON number decodes as a float64 and triggers a runtime panic before any signature, claims, or authorization check runs.\n\n\n\nThe panic terminates the entire kuma-cp process, HTTP API, the health and readiness endpoints, and xDS. Unauthenticated access to the dataplane gRPC server can trigger the crash with a malformed token\n\n\n\nA single request is a transient interruption; sustaining an outage requires repeated requests.",
  "id": "GHSA-7gh2-244h-962w",
  "modified": "2026-08-12T21:31:37Z",
  "published": "2026-08-12T21:31:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/security/advisories/GHSA-5mxq-7xq4-3vx8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18675"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17465"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17467"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17468"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17469"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17470"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17471"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17472"
    },
    {
      "type": "WEB",
      "url": "https://developer.konghq.com/mesh/changelog"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}



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