CVE-2026-41475

Critical

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.

SeverityCritical

CVSS9.1

Exploit probability—

ProductBacnetstack Bacnet Stack

PublishedApr 24, 2026

First seenApr 24, 2026

Weakness typeCWE-125Out-of-bounds read

How to fix

Update

bacnetstack bacnet_stack1.4.3 or later

Affected products

Product	Affected versions	Fixed in
bacnetstack bacnet_stack	1.4.0 ≤ v < 1.4.3, 1.5.0	1.4.3

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