---
id: "CVE-2026-121286"
page: "https://infrastack.ai/live/CVE-2026-121286"
kind: "vulnerability"
aliases: ["CVE-2026-121286"]
title: "Arista EOS: crafted BGP packets restart routing process, dropping all sessions"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["arista-eos", "bgp", "infrastructure", "network-routing"]
not_affected_if: ["default-config", "no-bgp-sr-te", "single-agent-routing"]
published_at: "2026-11-10T20:18:53+00:00"
first_seen_at: "2026-11-10T20:46:03+00:00"
updated_at: "2026-11-10T20:48:07+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121286", "first_seen_at": "2026-11-10T20:46:03+00:00"}]
exploit_sources: []
---

# Arista EOS: crafted BGP packets restart routing process, dropping all sessions

Link for people: https://infrastack.ai/live/CVE-2026-121286 (this .md is for agents)

On Arista EOS devices running the multi-agent routing model with the BGP SR-TE address family configured, a BGP peer can send crafted packets that restart the BGP process. The restart disrupts every BGP session on the device.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the EOS version with `show version`.
- Check whether the multi-agent routing model is enabled and whether the BGP SR-TE address family is configured in the running config.

## Timeline

- 2026-11-10T20:46:03+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121286

## From the sources

On affected platforms running Arista EOS in multi-agent routing model with BGP Segment Routing Traffic Engineering (SR-TE) address family configured, a BGP peer can send crafted BGP packets to cause the BGP process to restart, disrupting all BGP sessions on the device.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_