What’s Vulnerable › Vulnerabilities
CVE-2026-44283: etcd: Read access via PrevKv in etcd transactions may bypass RBAC authorization checks
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-14 · updated 2026-06-17
- Weakness: CWE-863
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.
Affected products
- etcd-io etcd: before 3.4.44; from 3.5.0 before 3.5.30; from 3.6.0 before 3.6.11 — fixed in 3.4.44, 3.5.30, 3.6.11
How to fix
Upgrade to a fixed version: etcd-io etcd 3.4.44, 3.5.30, 3.6.11. Check the vendor advisory for mitigations.
References
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