CVE-2026-44283— etcd: Read access via PrevKv in etcd transactions may bypass RBAC authorization checks
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I. Basic Information for CVE-2026-44283
Vulnerability Information
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Vulnerability Title
etcd: Read access via PrevKv in etcd transactions may bypass RBAC authorization checks
Source: NVD (National Vulnerability Database)
Vulnerability Description
etcd is a distributed key-value store for the data of a distributed system. Prior to 3.4.44, 3.5.30, and 3.6.11, a vulnerability in etcd allows read access via PrevKv, or lease attachment in Put requests within transaction operations, to bypass RBAC authorization checks. An authenticated user without sufficient read or lease-related permissions may be able to access unauthorized data or attach leases by invoking transaction operations with these features enabled. This vulnerability is fixed in 3.4.44, 3.5.30, and 3.6.11.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
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 3.4.44之前版本、3.5.30之前版本和3.6.11之前版本存在安全漏洞，该漏洞源于事务操作中通过PrevKv或Put请求中的租约附加绕过RBAC授权检查，导致经过身份验证但权限不足的用户能够访问未授权数据或附加租约。
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
II. Public POCs for CVE-2026-44283
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- https://github.com/etcd-io/etcd/security/advisories/GHSA-x35m-3gp4-4fh5x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2026-44283
IV. Related Vulnerabilities
Same product: etcd
Same vendor: etcd-io
Same weakness: CWE-863
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