CVE-2026-41502 | bacnet-stack BACnet Stack up to 1.4.2 ReadPropertyMultiple Service src/bacnet/rpm.c rpm_decode_object_id out-of-bounds (GHSA-7545-3fpx-4xw3 / EUVD-2026-25624)

VDB-359563 · CVE-2026-41502 · GHSA-7545-3FPX-4XW3 BACNET-STACK BACNET STACK UP TO 1.4.2 READPROPERTYMULTIPLE SERVICE SRC/BACNET/RPM.C RPM_DECODE_OBJECT_ID OUT-OF-BOUNDS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 3.09+ Summaryinfo A vulnerability, which was classified as problematic, has been found in bacnet-stack BACnet Stack up to 1.4.2. The affected element is the function rpm_decode_object_id of the file src/bacnet/rpm.c of the component ReadPropertyMultiple Service. This manipulation causes out-of-bounds. This vulnerability appears as CVE-2026-41502. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component. Detailsinfo A vulnerability has been found in bacnet-stack BACnet Stack up to 1.4.2 and classified as problematic. Affected by this vulnerability is the function rpm_decode_object_id of the file src/bacnet/rpm.c of the component ReadPropertyMultiple Service. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. The summary by CVE is: 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. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-41502 since 04/20/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 1.4.3 eliminates this vulnerability. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-25624). Productinfo Vendor bacnet-stack Name BACnet Stack Version 1.4.0 1.4.1 1.4.2 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.1 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds CWE: CWE-125 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: BACnet Stack 1.4.3 Timelineinfo 04/20/2026 CVE reserved 04/24/2026 +4 days Advisory disclosed 04/24/2026 +0 days VulDB entry created 04/25/2026 +0 days VulDB entry last update Sourcesinfo Advisory: GHSA-7545-3fpx-4xw3 Status: Confirmed CVE: CVE-2026-41502 (🔒) GCVE (CVE): GCVE-0-2026-41502 GCVE (VulDB): GCVE-100-359563 EUVD: 🔒 Entryinfo Created: 04/24/2026 23:07 Updated: 04/25/2026 00:53 Changes: 04/24/2026 23:07 (70), 04/25/2026 00:53 (1) Complete: 🔍 Cache ID: 99:1F4:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸