---
id: "CVE-2026-47258"
page: "https://infrastack.ai/live/CVE-2026-47258"
kind: "vulnerability"
aliases: ["CVE-2026-47258"]
title: "BACnet Stack: stack overflow in Notification Class lets attackers write memory"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["bacnet", "building-automation", "c", "embedded", "package"]
not_affected_if: ["not-network-reachable", "notification-class-not-compiled"]
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-2026-47258", "first_seen_at": "2026-11-12T20:40:26+00:00"}]
exploit_sources: []
---

# BACnet Stack: stack overflow in Notification Class lets attackers write memory

Link for people: https://infrastack.ai/live/CVE-2026-47258 (this .md is for agents)

BACnet Stack is a C library for BACnet building-automation devices. A stack-based out-of-bounds write in the Notification Class object's recipient-list handling (AddListElement) lets a crafted request corrupt device memory.

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

## How to check

- Find BACnet Stack builds in firmware or build files and check the version, for example `grep -ri bacnet` in the source tree.
- Confirm whether the Notification Class object is compiled in and reachable from the network.

## Fix

- BACnet Stack: upgrade to `1.4.4`, `1.5.1`, or `1.6.0` (match your release line).

## Timeline

- 2026-11-12T20:40:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-47258

## Documents

- [advisory] Vendor advisory: github.com https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-rjmv-3mcm-r83j

## 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 stack-based out-of-bounds write exists in the Notification Class object implementation when handling AddListElement for the recipient-list property. This issue has been patched in versions 1.4.4, 1.5.1, and 1.6.0.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_