---
title: "CVE-2026-87683: Brocade Fabric OS - Buffer Overflow"
description: "Brocade Fabric OS < 10.0.1 contains stack-based buffer overflow vulnerabilities caused by improper validation of array counts and string lengths in REST API management component, letting authenticated attackers cause denial-of-service or execute arbitrary code, exploit requires REST API access."
url: https://panop.io/threat-heartbeat/CVE-2026-87683/
---

# CVE-2026-87683 Brocade Fabric OS - Buffer Overflow

Brocade Fabric OS < 10.0.1 contains stack-based buffer overflow vulnerabilities caused by improper validation of array counts and string lengths in REST API management component, letting authenticated attackers cause denial-of-service or execute arbitrary code, exploit requires REST API access.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.48% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-87683)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

8 October 2026

Updated

15 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to version 10.0.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-87683](https://nvd.nist.gov/vuln/detail/CVE-2026-87683)
- [https://support.broadcom.com/external/content/SecurityAdvisories/0/39077](https://support.broadcom.com/external/content/SecurityAdvisories/0/39077)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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