← Vulnerability feed

Vulnerability record · CVE-2026-18674 · published 17 August 2026

CVE-2026-18674: Insufficient verification of data authenticity vulnerability

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.

7.0 CVSS 4.0 High EPSS 0.56% · top 55.7% CWE-345 · Insufficient verification of data authenticityCWE-863 · Incorrect authorization Awaiting Analysis
7.0CVSS 4.0 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
9References
31 Aug 2026Last modified by NVD

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/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:

References

LinkTags
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

Track CVE-2026-18674 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.8CVE-2023-38831WinRAR ZIP archive spoofing leads to arbitrary code executionWinRAR before 6.23 mishandles ZIP archives that contain a benign file and a folder with the same name, causing the folder's contents to be processed …KEVEPSS 100%analysed9.8CVE-2022-26871Trend Micro Apex Central unauthenticated arbitrary file uploadTrend Micro Apex Central (and Apex One) contains an arbitrary file upload flaw caused by insufficient verification of data authenticity (CWE-345). An…KEVEPSS 19%analysed

Source: NIST National Vulnerability Database (record CVE-2026-18674), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.