Auth bypass in Arista Networks Eos
CVE-2026-19640
On affected platforms running Arista EOS, an authenticated user with access to the gNMI (gRPC Network Management Interface) may receive incorrect authorization results, potentially allowing access beyond their currently assigned permissions. This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.
Affected products
Weakness classification (CWE)
References
- psirt@arista.com (vendor-advisory)
Frequently asked questions
- What is CVE-2026-19640?
- CVE-2026-19640 is a medium-severity vulnerability in Arista Networks Eos, classified under Incorrect Authorization. CVSS score: 4.2/10. Published 2026-09-16.
- How severe is CVE-2026-19640?
- Medium severity. CVSS v3 base score is 4.2 out of 10.