Description
On affected platforms running Arista EOS, if OpenConfig is configured and running a gNMI server on the system, and if gNSI Pathz is configured and a gNSI Pathz policy is present on the system, then gNMI may fail to correctly enforce the rules in this policy if both a group rule and a user rule for the same path is present in the policy. Under certain conditions, this can lead to an authenticated user gaining unauthorized permission to read or write gNMI paths that the Pathz policy is intended to restrict.
Published: 2026-09-16
Score: 7.7 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Solution

The following EOS releases contain the fix for this vulnerability: - 4.33.9M and later releases in the 4.33.x train - 4.34.7M and later releases in the 4.34.x train - 4.35.6M and later releases in the 4.35.x train - 4.36.1F and later releases in the 4.36.x train No hotfix is available for this vulnerability.


Vendor Workaround

Option 1: Disable gNSI Pathz entirely: switch#configure switch(config)#management api gnsi switch(config-mgmt-api-gnsi)#no service pathz Option 2: Push a new gNSI Pathz policy that does not contain any group rules, using only user-principal rules. To push a new policy via grpcurl: grpcurl -protoset ./pathz.proto.pb -H 'username:$USER' -v -d @ -plaintext $TARGET:$PORT gnsi.pathz.v1.Pathz/Rotate << EOF { "upload_request": { "version": "<version>", "created_on": <timestamp>, "policy": <policy> } } { "finalize_rotation": {} } EOF Ensure all rules in the policy use "user" as the principal rather than "group" to avoid triggering this vulnerability.

Tracking

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History

Wed, 16 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 16 Sep 2026 08:30:00 +0000

Type Values Removed Values Added
Description On affected platforms running Arista EOS, if OpenConfig is configured and running a gNMI server on the system, and if gNSI Pathz is configured and a gNSI Pathz policy is present on the system, then gNMI may fail to correctly enforce the rules in this policy if both a group rule and a user rule for the same path is present in the policy. Under certain conditions, this can lead to an authenticated user gaining unauthorized permission to read or write gNMI paths that the Pathz policy is intended to restrict.
Title Security Advisory 0164
Weaknesses CWE-842
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 7.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: Arista

Published:

Updated: 2026-09-16T14:52:02.194Z

Reserved: 2026-08-12T16:39:35.977Z

Link: CVE-2026-73439

cve-icon Vulnrichment

Updated: 2026-09-16T14:51:54.812Z

cve-icon NVD

Status : Received

Published: 2026-09-16T09:17:04.687

Modified: 2026-09-16T15:17:42.573

Link: CVE-2026-73439

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-16T15:00:07Z

Weaknesses