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CVE-2026-40279

נמוכה 3.7

תיאור (מקור, אנגלית)

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.

מדדים

CVSS 3.1
3.7 (LOW) מקור הציון: CNA CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS — סבירות ניצול
0% (אחוזון 000) נכון ל-25/9/2026
CWE
CWE-758

מוצרים מושפעים

bacnetstack: bacnet stack

קישורים