Improper Authorization in etcd - #VU139352
Published: July 24, 2026
Vulnerability identifier: #VU139352
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-285
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: CoreOS
Affected software:
etcd
etcd
Detailed vulnerability description
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to improper access control in the Watch gRPC API when processing open-ended range watch requests with clientv3.WithFromKey(). A remote user can send a specially crafted watch request to disclose sensitive information.
Only clusters with authentication enabled are vulnerable. Range/Get and DeleteRange requests are not affected.
Remediation
Install security update from vendor's website.