bacnet-stack BACnet Stack up to 1.4.5/1.5.0/1.6.0 MS/TP Receive Path buffer overflow

Summaryinfo

A vulnerability was found in bacnet-stack BACnet Stack up to 1.4.5/1.5.0/1.6.0. It has been classified as critical. The affected element is an unknown function of the component MS/TP Receive Path. The manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-82414. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in bacnet-stack BACnet Stack up to 1.4.5/1.5.0/1.6.0. This issue affects an unknown code block of the component MS/TP Receive Path. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. From versions 1.4.0 to before 1.4.6, 1.5.0 to before 1.5.1, and 1.6.0 to before 1.6.1, the BACnet MS/TP receive path decodes COBS frames into an output pointer inside the same fixed input buffer, but passes the full input-buffer size as the decode capacity. A long valid COBS payload can therefore write past the end of the actual remaining buffer. This issue has been patched in versions 1.4.6, 1.5.1, 1.6.1, and 1.7.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-82414 since 08/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 1.4.6, 1.5.1, 1.6.1 or 1.7.0 eliminates this vulnerability.

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Productinfo

Vendor

• bacnet-stack

Name

• BACnet Stack

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.5
• 1.5.0
• 1.6.0

CPE 2.3info

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CPE 2.2info

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