Memory Management Vulnerability in BACnet Stack for Embedded Systems
CVE-2026-100403

7.5HIGH

Key Information:

Vendor

Bacnet-stack

Status
Bacnet-stack
Vendor
CVE Published:
13 November 2026

What is CVE-2026-100403?

The BACnet Stack, an open source protocol stack for embedded systems, contains a vulnerability in its Linux WebSocket server that permits an unbounded growth of the fragment_buffer. This occurs when a peer sends continuous binary continuation fragments without signaling completion, leading the server to repeatedly allocate memory until exhaustion or process termination occurs. The vulnerability has been addressed in versions 1.4.6, 1.5.2, 1.6.1, and 1.7.0, limiting buffer growth to prevent denial-of-service conditions.

Affected Version(s)

bacnet-stack < 1.4.6 < 1.4.6

bacnet-stack >= 1.5.0, < 1.5.2 < 1.5.0, 1.5.2

bacnet-stack >= 1.6.0, < 1.6.1 < 1.6.0, 1.6.1

References

https://github.com/bacnet-stack/bacnet-stack/security/adv...
x_refsource_CONFIRM
https://github.com/bacnet-stack/bacnet-stack/pull/1433
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.