Vulnerability Details CVE-2026-41475
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 33.9%
CVSS Severity
CVSS v3 Score 9.1
References
Products affected by CVE-2026-41475
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cpe:2.3:a:bacnetstack:bacnet_stack:1.4.0
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cpe:2.3:a:bacnetstack:bacnet_stack:1.4.1
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cpe:2.3:a:bacnetstack:bacnet_stack:1.4.2
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cpe:2.3:a:bacnetstack:bacnet_stack:1.5.0