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CVE-2026-33413— etcd: Authorization bypasses in multiple APIs

Quick assessment

Affected
etcd-io etcd
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.

etcd是etcd-io开源的一套使用Go语言编写的用于分布式系统的键值存储系统。 etcd 3.4.42之前版本、3.5.28之前版本和3.6.9之前版本存在安全漏洞，该漏洞源于未经授权的用户可绕过身份验证或授权检查，可能导致信息泄露、拒绝服务和数据操作。

AI Predicted 9.8 Difficulty: Easy EPSS 0.34% · P25
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I. Basic Information for CVE-2026-33413

Vulnerability Information
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Vulnerability Title
etcd: Authorization bypasses in multiple APIs
Source: CVE Program / CVE List V5
Vulnerability Description
etcd is a distributed key-value store for the data of a distributed system. Prior to versions 3.4.42, 3.5.28, and 3.6.9, unauthorized users may bypass authentication or authorization checks and call certain etcd functions in clusters that expose the gRPC API to untrusted or partially trusted clients. In unpatched etcd clusters with etcd auth enabled, unauthorized users are able to call MemberList and learn cluster topology, including member IDs and advertised endpoints; call Alarm, which can be abused for operational disruption or denial of service; use Lease APIs, interfering with TTL-based keys and lease ownership; and/or trigger compaction, permanently removing historical revisions and disrupting watch, audit, and recovery workflows. Kubernetes does not rely on etcd’s built-in authentication and authorization. Instead, the API server handles authentication and authorization itself, so typical Kubernetes deployments are not affected. Versions 3.4.42, 3.5.28, and 3.6.9 contain a patch. If upgrading is not immediately possible, reduce exposure by treating the affected RPCs as unauthenticated in practice. Restrict network access to etcd server ports so only trusted components can connect and/or require strong client identity at the transport layer, such as mTLS with tightly scoped client certificate distribution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
etcd 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
etcd是etcd-io开源的一套使用Go语言编写的用于分布式系统的键值存储系统。 etcd 3.4.42之前版本、3.5.28之前版本和3.6.9之前版本存在安全漏洞，该漏洞源于未经授权的用户可绕过身份验证或授权检查，可能导致信息泄露、拒绝服务和数据操作。
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
etcd-io etcd >= 3.6.0-alpha.0, < 3.6.9 -

II. Public POCs for CVE-2026-33413

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III. Intelligence Information for CVE-2026-33413

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Vendor Advisories for CVE-2026-33413 (1)

IV. Related Vulnerabilities

Same product: etcd
Same vendor: etcd-io
Same weakness: CWE-862

V. Comments for CVE-2026-33413

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