BACnet Stack Vulnerability in Protocol Stack C Library for Embedded Systems
CVE-2026-26264

7.8HIGH

Key Information:

Vendor

Bacnet-stack

Status
Bacnet-stack
Vendor
CVE Published:
13 February 2026

What is CVE-2026-26264?

The BACnet Stack is an open-source protocol stack designed for embedded systems. A significant vulnerability was identified in its handling of malformed WriteProperty requests, particularly in the wp.c file. This vulnerability stems from the improper validation of APDU size during the decoding process, which can lead to a length underflow when a malformed APDU is processed. As a result, this may trigger an out-of-bounds read, potentially causing a crash and resulting in a Denial of Service (DoS) condition. It is crucial for users to upgrade to version 1.5.0rc4 or 1.4.3rc2 to mitigate this risk.

Affected Version(s)

bacnet-stack >= 1.5.0rc1, < 1.5.0rc4 < 1.5.0rc1, 1.5.0rc4

bacnet-stack < 1.4.3rc2 < 1.4.3rc2

References

https://github.com/bacnet-stack/bacnet-stack/security/adv...
x_refsource_CONFIRM
https://github.com/bacnet-stack/bacnet-stack/commit/4cc80...
x_refsource_MISC

CVSS V4

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.