---
id: "CVE-2026-47217"
page: "https://infrastack.ai/live/CVE-2026-47217"
kind: "vulnerability"
aliases: ["CVE-2026-47217"]
title: "BACnet Stack: remote crash via uncontrolled recursion in Channel object"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "bacnet-stack", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["bacnet", "c", "embedded", "package"]
not_affected_if: ["bacnet-stack-1.4.4-or-later", "bacnet-stack-1.5.1-or-later"]
published_at: "2026-11-12T20:18:39+00:00"
first_seen_at: "2026-11-12T20:40:26+00:00"
updated_at: "2026-11-12T20:42:09+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47217", "first_seen_at": "2026-11-12T20:40:26+00:00"}]
exploit_sources: []
---

# BACnet Stack: remote crash via uncontrolled recursion in Channel object

Link for people: https://infrastack.ai/live/CVE-2026-47217 (this .md is for agents)

BACnet Stack is an open source BACnet protocol library in C used in embedded building-automation devices. A remote attacker can trigger unbounded recursion through the Channel object, overflowing the stack in the default server application.

_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, for example `grep -ri bacnet` in your project's dependency or source tree.
- Confirm whether your server application uses the Channel object.

## Fix

- bacnet-stack `1.4.4` on the 1.4 line
- bacnet-stack `1.5.1` on the 1.5 line

## Timeline

- 2026-11-12T20:40:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-47217

## Documents

- [advisory] Vendor advisory: github.com https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-wjw5-q9g6-2764

## From the sources

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.4 and 1.5.1, a remote attacker can trigger an uncontrolled recursion and stack overflow in the default server application of bacnet-stack by abusing the Channel object. This issue has been patched in versions 1.4.4 and 1.5.1.

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