CVE-2026-62976

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Source

https://cve.org/CVERecord?id=CVE-2026-62976

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62976.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-62976

Aliases

GHSA-32jj-x86x-w98w

Published

2026-11-13T18:39:25Z

Modified

2026-11-14T10:45:15Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator

Summary

BACnet Stack: Consecutive AtomicWriteFile(record-access) appends can trigger a heap out-of-bounds read in the RAMFS file backend

Details

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to version 1.5.1, the RAMFS-backed FILE object implementation stores appended records as NUL-terminated strings, but its record-counting logic later walks the buffer as if an additional terminating empty record were present. As a result, two consecutive AtomicWriteFile(record-access) append requests can cause record_count() to call bacnet_strnlen() on a pointer that is already one byte past the end of the heap allocation. This issue has been patched in versions 1.5.1 and 1.6.0.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62976.json"
}

References

Affected packages

Git / github.com/bacnet-stack/bacnet-stack

Affected ranges

Type

GIT

Repo

https://github.com/bacnet-stack/bacnet-stack

Events

Introduced

Fixed

3a74c74a8139526e34da32c6cc41ed7c71aaded5

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.5.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        }
    ]
}

Affected versions

bacnet-stack-1.*

bacnet-stack-1.0.0

bacnet-stack-1.1.1

bacnet-stack-1.2.0

bacnet-stack-1.3.0

bacnet-stack-1.3.1

bacnet-stack-1.3.2

bacnet-stack-1.3.3

bacnet-stack-1.3.4

bacnet-stack-1.3.5

bacnet-stack-1.3.6

bacnet-stack-1.3.7

bacnet-stack-1.3.8

bacnet-stack-1.4.0

bacnet-stack-1.4.1

bacnet-stack-1.4.2

bacnet-stack-1.5.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62976.json"