---
id: "CVE-2026-45341"
page: "https://infrastack.ai/live/CVE-2026-45341"
kind: "vulnerability"
aliases: ["CVE-2026-45341"]
title: "BACnet Stack: crafted WriteProperty request crashes device via NULL pointer"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["bacnet", "building-automation", "c", "embedded", "package"]
not_affected_if: ["no-structured-view-objects", "writes-restricted-to-trusted-network"]
published_at: "2026-11-12T20:18:38+00:00"
first_seen_at: "2026-11-12T20:40:26+00:00"
updated_at: "2026-11-12T20:42:13+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45341", "first_seen_at": "2026-11-12T20:40:26+00:00"}]
exploit_sources: []
---

# BACnet Stack: crafted WriteProperty request crashes device via NULL pointer

Link for people: https://infrastack.ai/live/CVE-2026-45341 (this .md is for agents)

BACnet Stack is an open source BACnet protocol C library used in embedded building-automation devices. A crafted WriteProperty request that updates a structured view's subordinate list triggers a NULL pointer dereference, which can crash the device.

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

## Fix

- BACnet Stack `1.4.4` for the 1.4 line
- BACnet Stack `1.5.1` for the 1.5 line

## Timeline

- 2026-11-12T20:40:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-45341

## Documents

- [advisory] Vendor advisory: github.com https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-fv2r-c2m2-7qhh

## From the sources

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. From versions 1.4.0 to before 1.4.4, and 1.5.0 to before 1.5.1, a NULL pointer dereference can be triggered in bacnet_device_object_reference_decode() when a WriteProperty request updates OBJECT_STRUCTURED_VIEW / PROP_SUBORDINATE_LIST. This issue has been patched in versions 1.4.4 and 1.5.1.

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