What is CVE-2026-40279?

CVE-2026-40279 is a low-severity vulnerability in Bacnet-stack, classified under CWE-758. CVSS score: 3.7/10. Published 2026-04-21.

How severe is CVE-2026-40279?

Low severity. CVSS v3 base score is 3.7 out of 10.

Vulnerability in Bacnet-stack

CVE-2026-40279

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, decode_signed32() in src/bacnet/bacint.c reconstructs a 32-bit signed integer from four APDU bytes using signed left shifts. When any of th…

EPSS: 0.001 (20.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Bacnet-stack — versions < 1.4.3

Weakness classification (CWE)

CWE-758

References

https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-326g-j95f-gmxv (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-40279?: CVE-2026-40279 is a low-severity vulnerability in Bacnet-stack, classified under CWE-758. CVSS score: 3.7/10. Published 2026-04-21.
How severe is CVE-2026-40279?: Low severity. CVSS v3 base score is 3.7 out of 10.