---
title: "CVE-2026-73439: Arista EOS - Broken Access Control"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-73439/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-73439)

## 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](https://cwe.mitre.org/data/definitions/842.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-73439](https://nvd.nist.gov/vuln/detail/CVE-2026-73439)
- [https://www.arista.com/en/support/advisories-notices/security-advisory/24720-security-advisory-0164](https://www.arista.com/en/support/advisories-notices/security-advisory/24720-security-advisory-0164)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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