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CVE-2026-41503— BACnet Stack: Out-of-Bounds Read in ReadPropertyMultiple Property Decoder via Deprecated Tag Parser

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服务属性解码器中的越界读取漏洞，允许未经身份验证的远程攻击者通过发送带有截断属性列表的RPM请求读取超出分配缓冲区边界的数据。

AI Predicted 7.5 Difficulty: Easy EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1213 · Data from Information Repositories
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I. Basic Information for CVE-2026-41503

Vulnerability Information
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Vulnerability Title
BACnet Stack: Out-of-Bounds Read in ReadPropertyMultiple Property Decoder via Deprecated Tag Parser
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 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.
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服务属性解码器中的越界读取漏洞，允许未经身份验证的远程攻击者通过发送带有截断属性列表的RPM请求读取超出分配缓冲区边界的数据。
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-2026-41503

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III. Intelligence Information for CVE-2026-41503

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Vendor Advisories for CVE-2026-41503 (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-2026-41502 BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyMultiple Object ID Decoder

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-41503

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