CVE-2026-46677
Published:November 12, 2026
Updated:November 13, 2026
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.4 and 1.5.1, there is a client-side out-of-bounds read in the AtomicReadFile-ACK record-access handling path. The issue is caused by a mismatch between a remote returnedRecordCount value and the fixed local fileData[] array capacity in BACNET_ATOMIC_READ_FILE_DATA. The ACK decode path preserves the remote RecordCount, discards storage for excess records without truncating that count, and a downstream sink later iterates over the original RecordCount and indexes fileData[i] out of bounds. This issue has been patched in versions 1.4.4 and 1.5.1.
Affected Packages
https://github.com/bacnet-stack/bacnet-stack.git (GITHUB):
Affected version(s) =bacnet-stack-0.9.1 <bacnet-stack-1.4.4 || >=bacnet-stack-1.0.0 <bacnet-stack-1.4.4Fix Suggestion:
Update to version bacnet-stack-1.4.4https://github.com/bacnet-stack/bacnet-stack.git (GITHUB):
Affected version(s) =bacnet-stack-1.5.0 <bacnet-stack-1.5.1Fix Suggestion:
Update to version bacnet-stack-1.5.1Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.22