low
CVE-2026-44283
etcd RBAC bypass allows unauthorized data access via PrevKv/lease attachment in nested transaction Put requests
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | go.etcd.io/etcd/v3 | >= 3.6.0, <= 3.6.10 | 3.6.11 |
| go | go.etcd.io/etcd | <= 3.4.43 | 3.4.44 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Etcd | Etcd | before 3.4.44 from 3.5.0 before 3.5.30 from 3.6.0 before 3.6.11 |