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High · 7.5 CVE-2026-46674 EUVD-2026-124658

BACnet Stack: Out-of-Bounds Read in AtomicWriteFile Record Decoder via Unbounded returnedRecordCount

Published Nov 12, 2026 · Updated Nov 13, 2026 · Assigned by GitHub_M

Description

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.4 and 1.5.1, an out-of-bounds read vulnerability exists in bacnet-stack's AtomicWriteFile record-access path. The bug is caused by a mismatch between an externally controlled returnedRecordCount field and the fixed-size internal fileData[] array used by BACNET_ATOMIC_WRITE_FILE_DATA. This issue has been patched in versions 1.4.4 and 1.5.1.

Affected products

VendorProductAffectedFixed
bacnet-stack bacnet-stack < 1.4.4, < 1.5.1 —

References