CVE-2026-41475

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 v3.1 Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS — Exploit Prediction

0.0027

Probability of exploitation

0.50%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
bacnetstack	bacnet_stack	1.4.0 — 1.4.3
bacnetstack	bacnet_stack	All
bacnetstack	bacnet_stack	All
bacnetstack	bacnet_stack	All

References

Advisories & Patches

https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-cvv4-v3g6-4jmv https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-cvv4-v3g6-4jmv

Exploits

https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-cvv4-v3g6-4jmv https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-cvv4-v3g6-4jmv

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-41475? +

CVE-2026-41475 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0027, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-41475? +

CVE-2026-41475 affects products from bacnetstack, specifically: bacnet_stack. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41475? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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