---
id: "CVE-2026-120978"
page: "https://infrastack.ai/live/CVE-2026-120978"
kind: "vulnerability"
aliases: ["CVE-2026-120978"]
title: "Arista EOS: crafted BGP-LS message restarts the BGP agent unexpectedly"
severity: "medium"
cvss: 6.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["arista-eos", "bgp-ls", "infrastructure", "network"]
not_affected_if: ["no-bgp-ls", "no-dps-consumer-role", "unauthenticated-only"]
published_at: "2026-11-10T20:18:52+00:00"
first_seen_at: "2026-11-10T20:46:03+00:00"
updated_at: "2026-11-10T20:48:08+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-120978", "first_seen_at": "2026-11-10T20:46:03+00:00"}]
exploit_sources: []
---

# Arista EOS: crafted BGP-LS message restarts the BGP agent unexpectedly

Link for people: https://infrastack.ai/live/CVE-2026-120978 (this .md is for agents)

On Arista EOS devices running BGP-LS with the Dynamic Path Selection consumer role, a crafted message can make the BGP agent restart unexpectedly. The attacker must already hold an authenticated BGP-LS session with the device, and no Arista Pathfinder deployment is needed.

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

## How to check

- Check whether BGP-LS is configured and whether the Dynamic Path Selection consumer role is enabled on the device.
- Confirm the running EOS version against the affected versions listed by Arista; the sources do not give version ranges.

## Timeline

- 2026-11-10T20:46:03+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-120978

## From the sources

On affected Arista EOS platforms running Border Gateway Protocol with Link State ( BGP-LS) and configured with the Dynamic Path Selection (DPS) consumer role, an attacker who has established an authenticated BGP-LS session with the device can send a crafted message to cause the BGP agent to restart unexpectedly. An Arista Pathfinder deployment is not required.

---

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