Heap Out-of-Bounds Read in BACnet Stack for Embedded Systems
CVE-2026-62975

6.9MEDIUM

Key Information:

Vendor

Bacnet-stack

Status
Bacnet-stack
Vendor
CVE Published:
13 November 2026

What is CVE-2026-62975?

The BACnet Stack, an open-source BACnet protocol library for embedded systems, has a vulnerability where the RAMFS-backed FILE implementation allows for the replacement of existing records with user-controlled content. This occurs during AtomicWriteFile requests to modify records. If an attacker replaces a record with shorter data, the backend improperly adjusts the heap allocation, potentially leading to a heap out-of-bounds read due to a stale length calculated from the original file layout. The vulnerability has been addressed in versions 1.5.1 and 1.6.0.

Affected Version(s)

bacnet-stack < 1.5.1

References

https://github.com/bacnet-stack/bacnet-stack/security/adv...
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https://github.com/bacnet-stack/bacnet-stack/pull/1408
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CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.