CVE-2026-26264— BACnet Stack WriteProperty decoding length underflow leads to OOB read and crash
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I. Basic Information for CVE-2026-26264
Vulnerability Information
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Vulnerability Title
BACnet Stack WriteProperty decoding length underflow leads to OOB read and crash
Source: NVD (National Vulnerability Database)
Vulnerability Description
BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0rc4 and 1.4.3rc2, a malformed WriteProperty request can trigger a length underflow in the BACnet stack, leading to an out‑of‑bounds read and a crash (DoS). The issue is in wp.c within wp_decode_service_request. When decoding the optional priority context tag, the code passes apdu_len - apdu_size to bacnet_unsigned_context_decode without validating that apdu_size <= apdu_len. If a truncated APDU reaches this path, apdu_len - apdu_size underflows, resulting in a large size being used for decoding and an out‑of‑bounds read. This vulnerability is fixed in 1.5.0rc4 and 1.4.3rc2.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存读
Source: NVD (National Vulnerability Database)
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 1.5.0rc4之前版本和1.4.3rc2之前版本存在缓冲区错误漏洞，该漏洞源于处理格式错误的WriteProperty请求时可能触发长度下溢，导致越界读取和崩溃。
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 | >= 1.5.0rc1, < 1.5.0rc4 | - |
II. Public POCs for CVE-2026-26264
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · bacnet-stack · 2026-02-13 · 3 CVEs total
| CVE-2026-21878 | 7.5 HIGH | BACnet Stack Improperly Limits Pathnames to a Restricted Directory |
| CVE-2026-21870 | 5.5 MEDIUM | The BACnet Protocol Stack library has an Off-by-one Stack-based Buffer Overflow in tokeniz |
IV. Related Vulnerabilities
Same product: bacnet-stack
- CVE-2026-41503
BACnet Stack: Out-of-Bounds Read in ReadPropertyMultiple Pro - CVE-2026-41502
BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyM - 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-2026-21878
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-2026-41502
BACnet Stack: Off-by-One Out-of-Bounds Read in ReadPropertyM - 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-2026-21878
BACnet Stack Improperly Limits Pathnames to a Restricted Dir
Same weakness: CWE-125
- CVE-2026-8177
XML::LibXML versions through 2.0210 for Perl read out-of-bou - CVE-2026-6104
Global buffer over-read in mb_convert_encoding() with attack - CVE-2026-7258
Out-of-bounds read in urldecode() on NetBSD - CVE-2026-8186
Open5GS NF client.c ogs_sbi_client_send_via_scp_or_sepp out- - CVE-2026-3508
ASUS System Control Interface 缓冲区错误漏洞
V. Comments for CVE-2026-26264
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