---
id: "CVE-2026-62974"
page: "https://infrastack.ai/live/CVE-2026-62974"
kind: "vulnerability"
aliases: ["CVE-2026-62974"]
title: "BACnet Stack: malformed WriteProperty request hangs server, remote denial of service"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["bacnet", "building-automation", "c", "embedded", "package"]
not_affected_if: ["client-only", "not-network-exposed"]
published_at: "2026-11-13T16:19:29+00:00"
first_seen_at: "2026-11-13T16:47:35+00:00"
updated_at: "2026-11-13T16:48:18+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-62974", "first_seen_at": "2026-11-13T16:47:35+00:00"}]
exploit_sources: []
---

# BACnet Stack: malformed WriteProperty request hangs server, remote denial of service

Link for people: https://infrastack.ai/live/CVE-2026-62974 (this .md is for agents)

BACnet Stack is an open source BACnet protocol library in C used in embedded building-automation devices. A malformed but non-empty WriteProperty request can put the official server demo into a non-terminating loop that consumes memory, so the device stops responding.

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

## How to check

- Check the BACnet Stack version your build uses; affected versions are those before `1.4.5`, `1.5.1`, and `1.6.0`.
- Look for the official server demo or any build of this library that accepts BACnet WriteProperty requests from the network.

## Fix

- Move to `1.4.5`, `1.5.1`, or `1.6.0` depending on your release line.

## Timeline

- 2026-11-13T16:47:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-62974

## Documents

- [advisory] Vendor advisory: github.com https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-2c8x-f46r-8phh

## From the sources

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.5, 1.5.1, and 1.6.0, a malformed but non-empty BACnet WriteProperty request can drive the official server demo into a non-terminating request-processing loop with repeated heap-backed side effects. This results in a remote unauthenticated denial of service via uncontrolled resource consumption and a non-terminating request path. This issue has been patched in versions 1.4.5, 1.5.1, and 1.6.0.

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