---
id: "CVE-2026-49341"
page: "https://infrastack.ai/live/CVE-2026-49341"
kind: "vulnerability"
aliases: ["CVE-2026-49341"]
title: "BACnet Stack: remote denial of service in default demo server"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["bacnet-stack", "building-automation", "embedded", "package"]
not_affected_if: ["modified-server", "version-1.5.1-or-later"]
published_at: "2026-11-13T16:19:01+00:00"
first_seen_at: "2026-11-13T16:47:34+00:00"
updated_at: "2026-11-13T16:48:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49341", "first_seen_at": "2026-11-13T16:47:34+00:00"}]
exploit_sources: []
---

# BACnet Stack: remote denial of service in default demo server

Link for people: https://infrastack.ai/live/CVE-2026-49341 (this .md is for agents)

BACnet Stack is an open source C library implementing the BACnet building-automation protocol for embedded systems. Before version 1.5.1, a remote attacker can crash the default demo server built from the unmodified apps/server/main.c, causing denial of service.

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

## How to check

- Check the bacnet-stack version in use; `1.5.1` or later is not affected
- Look for builds of apps/server/main.c that were not modified from the upstream demo server

## Fix

- bacnet-stack: move to `1.5.1` or later

## Timeline

- 2026-11-13T16:47:34+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-49341

## Documents

- [advisory] Vendor advisory: github.com https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-7r8r-2rj2-5wvr

## From the sources

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to version 1.5.1, there is a remotely reachable denial-of-service vulnerability in bacnet-stack affecting the default demo server built from the unmodified apps/server/main.c. This issue has been patched in version 1.5.1.

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