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Solution
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Workaround
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Wed, 22 Apr 2026 00:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Tue, 21 Apr 2026 17:45:00 +0000
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| First Time appeared |
Bacnetstack
Bacnetstack bacnet Stack |
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| Vendors & Products |
Bacnetstack
Bacnetstack bacnet Stack |
Tue, 21 Apr 2026 16:45:00 +0000
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| Description | 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. | |
| Title | BACnet Stack: Undefined-behavior signed left shift in `decode_signed32()` | |
| Weaknesses | CWE-758 | |
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-04-21T19:18:58.492Z
Reserved: 2026-04-10T20:22:44.034Z
Link: CVE-2026-40279
Updated: 2026-04-21T19:03:16.067Z
Status : Received
Published: 2026-04-21T17:16:54.853
Modified: 2026-04-21T20:16:59.027
Link: CVE-2026-40279
No data.
OpenCVE Enrichment
Updated: 2026-04-21T17:30:37Z