---
id: CVE-2026-87676
title: >-
  A stack-based buffer overflow vulnerability exists in the security library
  component of Brocade Fabric OS versions before 10.0.1
summary: >-
  A stack-based buffer overflow vulnerability exists in the security library
  component of Brocade Fabric OS versions before 10.0.1. When parsing uploaded
  X.509 PEM certificates for management display, the system improperly validates
  the le…
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/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: '2026-10-08T03:16:36.950'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87676'
references:
  - url: 'https://support.broadcom.com/external/content/SecurityAdvisories/0/39082'
    label: sirt@brocade.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-08T03:03:35.546Z'
---

## Overview

A stack-based buffer overflow vulnerability exists in the security library component of Brocade Fabric OS versions before 10.0.1. When parsing uploaded X.509 PEM certificates for management display, the system improperly validates the length of the Authority Key Identifier (AKI) extension before copying string tokens into an internal memory buffer. An authenticated user with administrative privileges to import custom certificates can supply a certificate containing an intentionally oversized AKI extension. When the system processes or renders the certificate attributes, this can trigger a stack memory corruption leading to a denial-of-service (DoS) condition by crashing the management daemon.

## Remediation

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