CVE-2026-41503 | bacnet-stack BACnet Stack up to 1.4.2 ReadPropertyMultiple Service src/bacnet/rpm.c rpm_decode_object_property out-of-bounds (GHSA-5w2v-mwqj-pr2c / EUVD-2026-25625)

VDB-359564 · CVE-2026-41503 · GHSA-5W2V-MWQJ-PR2C BACNET-STACK BACNET STACK UP TO 1.4.2 READPROPERTYMULTIPLE SERVICE SRC/BACNET/RPM.C RPM_DECODE_OBJECT_PROPERTY OUT-OF-BOUNDS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 3.94+ Summaryinfo A vulnerability, which was classified as problematic, was found in bacnet-stack BACnet Stack up to 1.4.2. The impacted element is the function rpm_decode_object_property of the file src/bacnet/rpm.c of the component ReadPropertyMultiple Service. Such manipulation leads to out-of-bounds. This vulnerability is traded as CVE-2026-41503. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component. Detailsinfo A vulnerability was found in bacnet-stack BACnet Stack up to 1.4.2 and classified as problematic. Affected by this issue is the function rpm_decode_object_property 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. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is availability. CVE summarizes: BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.4.3, an out-of-bounds read vulnerability in bacnet-stack's ReadPropertyMultiple service property decoder allows unauthenticated remote attackers to read past allocated buffer boundaries by sending an RPM request with a truncated property list. The vulnerability stems from rpm_decode_object_property() calling the deprecated decode_tag_number_and_value() function at src/bacnet/rpm.c:344, which accepts no buffer length parameter and reads blindly from whatever pointer it receives. A crafted BACnet/IP packet with a 1-byte property payload containing an extended tag marker (0xF9) causes the decoder to read 1 byte past the end of the buffer, 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. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-41503 since 04/20/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. Upgrading to version 1.4.3 eliminates this vulnerability. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-25625). 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-5w2v-mwqj-pr2c Status: Confirmed CVE: CVE-2026-41503 (🔒) GCVE (CVE): GCVE-0-2026-41503 GCVE (VulDB): GCVE-100-359564 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:E62:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸