3.7
CVE-2026-40279
- EPSS 0.24%
- Veröffentlicht 21.04.2026 16:29:16
- Zuletzt bearbeitet 27.04.2026 19:49:23
- Quelle security-advisories@github.com
- CVE-Watchlists
- Unerledigt
LoginBACnet Stack: Undefined-behavior signed left shift in `decode_signed32()`
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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Bacnetstack ≫ Bacnet Stack Version < 1.4.3
| Typ | Quelle | Score | Percentile |
|---|---|---|---|
| EPSS | FIRST.org | 0.24% | 0.151 |
| Quelle | Base Score | Exploit Score | Impact Score | Vector String |
|---|---|---|---|---|
| security-advisories@github.com | 3.7 | 2.2 | 1.4 |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
|
CWE-758 Reliance on Undefined, Unspecified, or Implementation-Defined Behavior
The product uses an API function, data structure, or other entity in a way that relies on properties that are not always guaranteed to hold for that entity.
https://github.com/bacnet-stack/bacnet-stack/security/advisories/GHSA-326g-j95f-gmxv