Improper access control in etcd - CVE-2026-33343
Published: May 5, 2026
Vulnerability identifier: #VU130101
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-33343
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: CoreOS
Affected software:
etcd
etcd
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass key-level authorization checks.
The vulnerability exists due to improper access control in nested etcd transactions when processing transaction requests. A remote attacker can send crafted nested transactions to bypass key-level authorization checks.
Typical Kubernetes deployments are not affected because Kubernetes does not rely on etcd built-in authentication and authorization.
How to mitigate CVE-2026-33343
Install security update from vendor's website.