Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Bacnetstack | Bacnet Stack | >= 1.4.0, < 1.4.3 |
Related Weaknesses (CWE)
References
- https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-cvv4-v3g6-ExploitMitigationVendor Advisory
- https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-cvv4-v3g6-ExploitMitigationVendor Advisory
FAQ
What is CVE-2026-41475?
CVE-2026-41475 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 u...
How severe is CVE-2026-41475?
CVE-2026-41475 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-41475?
Check the references section above for vendor advisories and patch information. Affected products include: Bacnetstack Bacnet Stack.