CVE-2026-41502— BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyMultiple Object ID Decoder
Possible ATT&CK Techniques 2AI
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I. Basic Information for CVE-2026-41502
Vulnerability Information
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Vulnerability Title
BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyMultiple Object ID Decoder
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
BACnet Stack 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BACnet Stack是BACnet Stack开源的一个适用于嵌入式系统、Linux、MacOS、BSD 和 Windows 的 BACnet 开源协议栈 C 库。 BACnet Stack 1.4.3之前版本存在缓冲区错误漏洞，该漏洞源于bacnet-stack的ReadPropertyMultiple服务解码器中的差一越界读取漏洞，允许未经身份验证的远程攻击者通过发送带有截断对象标识符的特制RPM请求读取超出分配缓冲区边界的一个字节。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bacnet-stack | bacnet-stack | >= 1.4.0, < 1.4.3 | - |
II. Public POCs for CVE-2026-41502
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|---|
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Vendor Advisories for CVE-2026-41502 (1)
Same Patch Batch · bacnet-stack · 2026-04-24 · 3 CVEs total
| CVE-2026-41475 | BACnet Stack: Out-of-Bounds Read in WritePropertyMultiple Decoder via Deprecated Tag Parse | |
| CVE-2026-41503 | BACnet Stack: Out-of-Bounds Read in ReadPropertyMultiple Property Decoder via Deprecated T |
IV. Related Vulnerabilities
Same product: bacnet-stack
- CVE-2026-41503
BACnet Stack: Out-of-Bounds Read in ReadPropertyMultiple Pro - CVE-2026-41475
BACnet Stack: Out-of-Bounds Read in WritePropertyMultiple De - CVE-2026-40279
BACnet Stack: Undefined-behavior signed left shift in `decod - CVE-2026-26264
BACnet Stack WriteProperty decoding length underflow leads t - CVE-2026-21878
BACnet Stack Improperly Limits Pathnames to a Restricted Dir
Same vendor: bacnet-stack
- CVE-2026-41503
BACnet Stack: Out-of-Bounds Read in ReadPropertyMultiple Pro - CVE-2026-41475
BACnet Stack: Out-of-Bounds Read in WritePropertyMultiple De - CVE-2026-40279
BACnet Stack: Undefined-behavior signed left shift in `decod - CVE-2026-26264
BACnet Stack WriteProperty decoding length underflow leads t - CVE-2026-21878
BACnet Stack Improperly Limits Pathnames to a Restricted Dir
Same weakness: CWE-125
- CVE-2026-12630
6LoWPAN IPHC uncompression out-of-bounds read on reserved de - CVE-2026-40144
Memory corruption vulnerability in Endpoint Privilege Manage - CVE-2026-19955
TrailDB TOC Validation tdb.c tdb_open out-of-bounds - CVE-2026-49282
Capstone M68K and RISCV `cs_insn_name()` invalid IDs can tri - CVE-2026-18020
IBM i is Affected By Multiple Vulnerabilities in NetServer
V. Comments for CVE-2026-41502
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