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CVE-2026-18675— Kong Mesh: control plane denial of service via a malformed dataplane token with a non-string JWT kid

Quick assessment

Affected
Kong Inc. Kong Mesh
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kuma是Kuma组织开源的一个基于 Envoy 的现代化服务网格，可在任何云平台上运行，支持单区域或多区域部署，并兼容 Kubernetes 和虚拟机。 Kuma 2.7.29之前版本、2.8.0至2.9.19之前版本、2.10.0至2.11.18之前版本、2.12.0至2.12.14之前版本、2.13.0至2.13.10之前版本和2.14.0至2.14.2之前版本存在安全漏洞，该漏洞源于kuma-cp的数据平面令牌验证器对JWT kid标头执行未检查的Go类型断言，可能导致未经身份验证的攻击者通过发送

CVSS 5.3 · Medium EPSS 0.56% · P45

Affected Version Matrix 6

VendorProduct Version RangeStatus
Kong Inc. Kong Mesh < 2.7.29 affected
2.8.0< 2.9.19 affected
2.10.0< 2.11.18 affected
2.12.0< 2.12.14 affected
2.13.0< 2.13.10 affected
2.14.0< 2.14.2 affected
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I. Basic Information for CVE-2026-18675

Vulnerability Information
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Vulnerability Title
Kong Mesh: control plane denial of service via a malformed dataplane token with a non-string JWT kid
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
Kuma 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kuma是Kuma组织开源的一个基于 Envoy 的现代化服务网格，可在任何云平台上运行，支持单区域或多区域部署，并兼容 Kubernetes 和虚拟机。 Kuma 2.7.29之前版本、2.8.0至2.9.19之前版本、2.10.0至2.11.18之前版本、2.12.0至2.12.14之前版本、2.13.0至2.13.10之前版本和2.14.0至2.14.2之前版本存在安全漏洞，该漏洞源于kuma-cp的数据平面令牌验证器对JWT kid标头执行未检查的Go类型断言，可能导致未经身份验证的攻击者通过发送
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Kong Inc. Kong Mesh 0 ~ 2.7.29 -

II. Public POCs for CVE-2026-18675

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III. Intelligence Information for CVE-2026-18675

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Patches & Fixes for CVE-2026-18675 (8)

Vendor Advisories for CVE-2026-18675 (1)

Same Patch Batch · Kong Inc. · 2026-08-12 · 6 CVEs total

CVE-2026-18677 6.0 MEDIUM Kong Mesh: a dataplane token without a workload binding can claim any workload's SPIFFE id
CVE-2026-18679 5.8 MEDIUM Kong Mesh: kuma-dp connects to the control plane without verifying the TLS certificate whe
CVE-2026-18678 5.5 MEDIUM Kong Mesh: kumactl connects to the control plane without verifying the TLS certificate whe
CVE-2026-18673 5.3 MEDIUM Kong Mesh: the kuma-dp readiness service exposes the Envoy admin API without authenticatio
CVE-2026-18676 5.1 MEDIUM Kong Mesh: default control plane config leaks the admin token cross-origin via a CORS wild

IV. Related Vulnerabilities

Same product: Kong Mesh
Same vendor: Kong Inc.
Same weakness: CWE-248

V. Comments for CVE-2026-18675

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