CVE-2026-18674
Kong Mesh multi-zone: the global control plane attributes KDS-synced resources by an unvalidated in-band zone identifier
- State
- Published
- Severity
- 7.0 High
- Published
- Aug 17, 2026
- Updated
- Aug 17, 2026
- Reserved
- Aug 3, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | Kong |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
Kong MeshKong Inc. |
|
References
- Upstream advisory GHSA-m58j-fjmc-h3g4vendor-advisory
- kumahq/kuma#17456 (master)patch
- kumahq/kuma#17458 (release-2.14 backport)patch
- kumahq/kuma#17461 (release-2.13 backport)patch
- kumahq/kuma#17463 (release-2.12 backport)patch
- kumahq/kuma#17462 (release-2.11 backport)patch
- kumahq/kuma#17460 (release-2.9 backport)patch
- kumahq/kuma#17459 (release-2.7 backport)patch
- Kong Mesh Changelogrelease-notes
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