etcd RBAC bypass allows unauthorized data access via PrevKv/lease attachment in nested transaction Put requests — CVE-2026-44283

Summary

### Impact _What kind of vulnerability is it? Who is impacted?_ 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.…

Product

go: go.etcd.io/etcd/v3 | go: go.etcd.io/etcd

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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