GHSA-FXCR-QWX6-5H7Q

Vulnerability from github – Published: 2026-08-17 15:30 – Updated: 2026-08-17 15:30
VLAI
Details

On a Kong Mesh global control plane, resources received over the zone-to-global KDS sync are attributed using the in-band, sender-controlled ControlPlane.Identifier rather than the authenticated zone identity derived from the connection. Authenticated zones can have the global control plane store and re-distribute those resources as belonging to another zone.

The result is a cross-zone isolation bypass: the holder of a single enrolled zone's credential can inject, attribute, and overwrite resources in another zone's namespace mesh-wide.

The root cause lives in Kuma's open-source KDS sync code, which Kong Mesh's control plane is built on.

Severity
7.0 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/VA:N/SC:L/SI:L/SA:N
Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-18674"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-345"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-17T13:16:51Z",
    "severity": "HIGH"
  },
  "details": "On a Kong Mesh global control plane, resources received over the zone-to-global KDS sync are attributed using the in-band, sender-controlled ControlPlane.Identifier rather than the authenticated zone identity derived from the connection. Authenticated zones can have the\u00a0global control plane store and re-distribute those resources as belonging to another zone.\n\n\n\nThe result is a cross-zone isolation bypass: the holder of a single enrolled zone\u0027s credential can inject, attribute, and overwrite resources in another zone\u0027s namespace mesh-wide.\n\n\n\n\nThe root cause lives in Kuma\u0027s open-source KDS sync code, which Kong Mesh\u0027s control plane is built on.",
  "id": "GHSA-fxcr-qwx6-5h7q",
  "modified": "2026-08-17T15:30:38Z",
  "published": "2026-08-17T15:30:38Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/security/advisories/GHSA-m58j-fjmc-h3g4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18674"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17456"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17458"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17459"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17460"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17461"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17462"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kumahq/kuma/pull/17463"
    },
    {
      "type": "WEB",
      "url": "https://developer.konghq.com/mesh/changelog"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/VA:N/SC:L/SI:L/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"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.