CVE-2026-18674
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.38%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 7.0 HIGHCVSS: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/M
- EPSS
- 0.38% probability · 32th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-345, CWE-863
- Source
- 02762ae7-200e-4b20-9b2b-a77d5b8fc4cb
References
- https://developer.konghq.com/mesh/changelog/
- https://github.com/kumahq/kuma/pull/17456
- https://github.com/kumahq/kuma/pull/17458
- https://github.com/kumahq/kuma/pull/17459
- https://github.com/kumahq/kuma/pull/17460
- https://github.com/kumahq/kuma/pull/17461
- https://github.com/kumahq/kuma/pull/17462
- https://github.com/kumahq/kuma/pull/17463
- https://github.com/kumahq/kuma/security/advisories/GHSA-m58j-fjmc-h3g4
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.