Brocade Fabric OS: Heap-based buffer overflow in trunk configuration
Summary
Brocade Fabric OS versions before 10.0.1 contain a heap-based buffer overflow in the trunk configuration code, where user-supplied list strings are parsed without boundary checks. An authenticated administrator can send crafted REST API requests with an excessive number of list delimiters to corrupt heap memory, which can crash the switch or, in theory, lead to arbitrary code execution. Fabric OS runs on Fibre Channel SAN switches and directors, so exposure is mainly relevant where the management interface is reachable from broader networks.
Affected
- Brocade Fabric OS versions before 10.0.1
- Status of 9.2.x builds for this CVE: Unknown.
Fixed in
- Fabric OS 10.0.1 and later (per the CNA record and Broadcom notification; verify against the Broadcom advisory)
- HPE-branded hardware: use HPE's advisory HPESBST05161.
Workaround
- No specific workaround documented in the sources reviewed.
- Restrict access to the switch management interface to a dedicated admin network.
- Review admin accounts and disable or restrict REST API access where not needed.
Exploitation
- Not listed in CISA KEV.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- EPSS below 1%.
- No public proof of concept found in the searches performed; this does not prove none exists.
- Exploitation status: Unknown.
Our recommendation
- Patch Fabric OS to 10.0.1 or later in the next maintenance window; do not defer indefinitely.
- Check whether any SAN switch runs a 10.0.x or 9.2.x build and plan the upgrade.
- Restrict management interface access to an admin network and limit admin credentials.
- Monitor switch logs for unexpected REST API activity and crashes.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Broadcom Security Advisory support.broadcom.com
- Broadcom notification listing FOS 10.0.1 fix support.broadcom.com
- OpenCVE CVE-2026-87679 app.opencve.io
- VulDB CVE-2026-87679 vuldb.com
- Vulners CVELIST CVE-2026-87679 vulners.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 11:14.
Original description (NVD)
When Brocade Fabric OS versions before 10.0.1 processes trunk configuration operations, the application parses user-supplied list strings into dynamically allocated heap arrays without enforcing boundary checks on the maximum allowable number of elements. An authenticated administrator can exploit this vulnerability via crafted REST API requests containing an excessive number of list delimiters, causing heap corruption that can result in service crash or arbitrary code execution.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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