CVE-2026-41502

The record

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an off-by-one out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service decoder allows unauthenticated remote attackers to read one byte past an allocated buffer boundary by sending a crafted RPM request with a truncated object identifier. The vulnerability is in rpm_decode_object_id(), which checks apdu_len < 5 but then accesses all 6 byte positions (indices 0-5) — consuming 1 byte for the context tag, 4 bytes for the object ID, then reading apdu[5] for the opening tag check. A 5-byte input passes the length check but causes a 1-byte OOB read, leading to crashes on embedded BACnet devices. The vulnerability exists in src/bacnet/rpm.c and affects any deployment that enables the ReadPropertyMultiple confirmed service handler (enabled by default in the reference server). This vulnerability is fixed in 1.4.3.

Affected packages

Related vulnerabilities

• CVE-2026-92824 A flaw was found in libmodulemd. CWE-125
• CVE-2026-114038 A flaw was found in device-mapper-multipath. CWE-125
• CVE-2026-112896 Pillow is a Python imaging library. CWE-125
• CVE-2026-112278 rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in… CWE-125
• CVE-2026-112273 libtins through 4.6 contains a heap out-of-bounds read vulnerability in DNS::compose_name… CWE-125
• CVE-2026-112073 A vulnerability was identified in Tencent ncnn up to 44b02dabdcf97499281a4692ebd65bad73dc… CWE-125
• CVE-2026-112020 LodePNG through 20261006 contains a heap out-of-bounds read vulnerability in… CWE-125
• CVE-2026-88842 A flaw was found in BusyBox dpkg. CWE-125