CVE-2026-40279

Katalog CVE

CVSS 3.7 · Low EPSS 0,33%

Kerentanan Reliance on Undefined, Unspecified, or Implementation-Defined Behavior pada bacnetstack bacnet stack. Skor CVSS 3.1 3.7 (Low) menurut github.com.

Deskripsi (NVD)

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 the four bytes has bit 7 set (value ≥ 0x80), the left-shift operation overflows a signed int32_t, which is undefined behavior per the C standard. This is flagged thousands of times per minute by UndefinedBehaviorSanitizer on any BACnet input containing signed-integer property values with high-bit-set bytes. This vulnerability is fixed in 1.4.3.

Rincian

Terbit di NVD

21 April 2026

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

3.7 (Low), sumber github.com
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-758: Reliance on Undefined, Unspecified, or Implementation-Defined Behavior

EPSS (30 hari)

0,33% peluang dieksploitasi; lebih tinggi dari 24,4% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-326g-j95f-gmxv exploit · mitigasi · advisory vendor