---
id: CVE-2026-87668
title: >-
  A stack-based buffer overflow vulnerability exists in the diagnostic execution
  utility of Brocade Fabric OS versions before 10.0.1
summary: >-
  A stack-based buffer overflow vulnerability exists in the diagnostic execution
  utility of Brocade Fabric OS versions before 10.0.1. When processing command
  arguments for diagnostic operations, the utility tokenizes user-supplied input
  in…
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-121
vendor: Brocade
product: Fabric OS
affected:
  - fabric_os < 10.0.1
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T03:16:36.100'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87668'
references:
  - url: 'https://support.broadcom.com/external/content/SecurityAdvisories/0/39152'
    label: sirt@brocade.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-08T04:04:32.114Z'
---

## Overview

A stack-based buffer overflow vulnerability exists in the diagnostic execution utility of Brocade Fabric OS versions before 10.0.1. When processing command arguments for diagnostic operations, the utility tokenizes user-supplied input into an internal argument array without enforcing boundary checks on the maximum array capacity. An authenticated user with administrative access can exploit this vulnerability by supplying a crafted diagnostic command string containing an excessive number of tokenized arguments. This leads to a memory overwrite resulting in a denial of service (process crash).

## Remediation

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