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CVE-2026-50166— Kuma: kumactl connects to control plane without verifying TLS certificate when no CA is configured

Quick assessment

Affected
kumahq kuma
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 是一个基于 Envoy 构建的现代服务网格，支持在 Kubernetes 和虚拟机环境中的各类云平台上运行。在 2.7.26、2.9.16、2.11.14、2.12.11 和 2.13.7 之前的版本中，如果用户手动配置了一个指向 HTTPS 控制平面的 kumactl profile，但未指定 --ca-cert-file 参数，则会禁用 TLS 对等方验证，并导致 API 令牌在未经验证的安全连接上传输。网络路径上的攻击者可以拦截用户或管理员的 API 令牌，并以被泄露令牌的用户身份向控制平面发起请求

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-50166

Vulnerability Information
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Vulnerability Title
Kuma: kumactl connects to control plane without verifying TLS certificate when no CA is configured
Source: CVE Program / CVE List V5
Vulnerability Description
Kuma is a modern Envoy-based service mesh that can run on every cloud across both Kubernetes and VMs. Prior to 2.7.26, 2.9.16, 2.11.14, 2.12.11, and 2.13.7, a kumactl profile manually configured for an HTTPS control plane without --ca-cert-file disables TLS peer verification and sends API tokens over the unverified connection. An attacker on the network path can intercept user or administrator API tokens and act against the control plane as the compromised user. The default local profile is unaffected because it uses plain HTTP. This issue is fixed in versions 2.7.26, 2.9.16, 2.11.14, 2.12.11, and 2.13.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
kumahq kuma < 2.7.26 -

II. Public POCs for CVE-2026-50166

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III. Intelligence Information for CVE-2026-50166

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Patches & Fixes for CVE-2026-50166 (7)

Vendor Advisories for CVE-2026-50166 (1)

IV. Related Vulnerabilities

Same product: kuma
Same vendor: kumahq
Same weakness: CWE-295

V. Comments for CVE-2026-50166

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