---
id: CVE-2026-102178
title: >-
  A Stack-based Buffer Overflow vulnerability in the BGP routing daemon of
  Juniper Networks Junos OS and Junos OS Evolved allows a configured BGP
  flowspec peer to cause routing-engine compromise or a routing-daemon denial of
  service via fl…
summary: >-
  A Stack-based Buffer Overflow vulnerability in the BGP routing daemon of
  Juniper Networks Junos OS and Junos OS Evolved allows a configured BGP
  flowspec peer to cause routing-engine compromise or a routing-daemon denial of
  service via fl…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-121
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T17:18:05.610'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102178'
references:
  - url: 'https://supportportal.juniper.net/JSA112187'
    label: sirt@juniper.net
tags:
  - nvd
ingestedAt: '2026-10-14T17:44:53.669Z'
---

## Overview

A Stack-based Buffer Overflow vulnerability in the BGP routing daemon of Juniper Networks Junos OS and Junos OS Evolved allows a configured BGP flowspec peer to cause routing-engine compromise or a routing-daemon denial of service via flowspec route re-advertisement when BGP update-threading is enabled.

## Remediation

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