---
id: "CVE-2026-47259"
page: "https://infrastack.ai/live/CVE-2026-47259"
kind: "vulnerability"
aliases: ["CVE-2026-47259"]
title: "BACnet Stack: oversized list request causes stack out-of-bounds write"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "BACnet Stack", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["bacnet", "building-automation", "c", "embedded", "package"]
not_affected_if: ["no-bacnet-writes-exposed"]
published_at: "2026-11-12T20:18:40+00:00"
first_seen_at: "2026-11-12T20:40:26+00:00"
updated_at: "2026-11-12T20:42:04+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47259", "first_seen_at": "2026-11-12T20:40:26+00:00"}]
exploit_sources: []
---

# BACnet Stack: oversized list request causes stack out-of-bounds write

Link for people: https://infrastack.ai/live/CVE-2026-47259 (this .md is for agents)

BACnet Stack is an open source BACnet protocol C library used in embedded building-automation devices. A crafted RemoveListElement request with more than NC_MAX_RECIPIENTS destinations writes past a stack buffer, which can corrupt memory on the device.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:BACnet Stack affected range not listed fixed no fixed version listed

## How to check

- Check the BACnet Stack version in your build or vendored source, for example by reading the version define in the library headers
- Look for Notification-Class objects that accept RemoveListElement writes from the network

## Fix

- Move to `1.4.4`, `1.5.1`, or `1.6.0` depending on your release line

## Timeline

- 2026-11-12T20:40:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-47259

## Documents

- [advisory] Vendor advisory: github.com https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-9w9m-w7w5-rrv3

## From the sources

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.4, 1.5.1, and 1.6.0, a RemoveListElement request targeting Notification-Class.recipient-list can trigger a stack-based out-of-bounds write in the current master branch when the request contains more than NC_MAX_RECIPIENTS valid BACnetDestination elements. This issue has been patched in versions 1.4.4, 1.5.1, and 1.6.0.

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