CVE-2026-73439 Arista EOS - Broken Access Control

Arista EOS contains a broken access control vulnerability caused by improper enforcement of gNSI Pathz policy rules when both group and user rules exist for the same path, letting authenticated users gain unauthorized read/write access to gNMI paths, exploit requires authenticated user access.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.36% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control, Data Tampering, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-842

Vendor fix

Update to the latest Arista EOS version with the fix for gNSI Pathz policy enforcement.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs