# CVE-2026-41475

> Vulnerability · severity: **CRITICAL** (CVSS 9.1).

## Description

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an out-of-bounds read vulnerability in bacnet-stack's WritePropertyMultiple service decoder allows unauthenticated remote attackers to read past allocated buffer boundaries by sending a truncated WPM request. The vulnerability stems from wpm_decode_object_property() calling the deprecated decode_tag_number_and_value() function, which performs no bounds checking on the input buffer. A crafted BACnet/IP packet with a truncated property payload causes the decoder to read 1-7 bytes past the end of the buffer, leading to crashes or information disclosure on embedded BACnet devices. This vulnerability is fixed in 1.4.3.

## Key facts

- **CVE ID:** CVE-2026-41475
- **Published:** 2026-04-24
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.1
- **CWE codes:** CWE-125

## Affected products

- `bacnetstack:bacnet_stack`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-41475

## Citation

> AI Analytics. CVE-2026-41475. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-41475. Derived from NIST NVD. Licensed CC0.

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