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CVE-2026-41502— BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyMultiple Object ID Decoder

Quick assessment

Affected
bacnet-stack bacnet-stack
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.60% · P47
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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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III. Intelligence Information for CVE-2026-41502

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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
Same vendor: bacnet-stack
Same weakness: CWE-125

V. Comments for CVE-2026-41502

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