---
id: CVE-2026-73460
title: >-
  On affected platforms running Arista EOS with IS-IS graceful restart enabled,
  an unauthenticated attacker who can inject a malformed IS-IS LSP PDU packet
  can cause the IS-IS graceful restart procedure to terminate prematurely
summary: >-
  On affected platforms running Arista EOS with IS-IS graceful restart enabled,
  an unauthenticated attacker who can inject a malformed IS-IS LSP PDU packet
  can cause the IS-IS graceful restart procedure to terminate prematurely. This
  may r…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-863
vendor: Arista Networks
product: EOS
affected:
  - EOS >= 4.36.0 <= 4.36.1F
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T20:17:28.110'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73460'
references:
  - url: >-
      https://www.arista.com/en/support/advisories-notices/security-advisory/24716-security-advisory-0160
    label: psirt@arista.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-16T19:35:29.181267Z'
ingestedAt: '2026-09-15T23:46:25.572Z'
epss: 0.00197
epssPercentile: 0.0838
---

## Overview

On affected platforms running Arista EOS with IS-IS graceful restart enabled, an unauthenticated attacker who can inject a malformed IS-IS LSP PDU packet can cause the IS-IS graceful restart procedure to terminate prematurely. This may result in traffic loss following a restart event.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.