CVE-2026-52786

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Source

https://cve.org/CVERecord?id=CVE-2026-52786

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52786.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-52786

Aliases

GHSA-c4q6-7827-mfg6

Published

2026-11-12T19:59:45Z

Modified

2026-11-13T10:46:33Z

Severity

7.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H CVSS Calculator

Summary

BACnet Stack: malicious ReadPropertyMultiple-ACK with excessive properties causes global-buffer-overflow in ProcessRPMData()

Details

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.5, 1.5.1, and 1.6.0, in the official apps/epics client tool on v1.6.0-rc1 (not in the generic BACnet RPM ACK decoder alone) a malicious BACnet/IP endpoint can reply to the EPICS tool’s legitimate ReadPropertyMultiple request with a syntactically valid ReadPropertyMultiple-ACK that contains more heading properties than the tool’s fixed local storage can hold. The response is decoded successfully and later consumed by ProcessRPMData(), which writes property values into a fixed global array using an unbounded linear index. This results in a reproducible global-buffer-overflow in apps/epics/main.c. This is a network-reachable memory corruption in the official epics tool’s response-processing path. The root cause is that apps/epics treats a remotely supplied variable-length RPM property list as if it were a trusted, fixed-size local heading-property set. This issue has been patched in versions 1.4.5, 1.5.1, and 1.6.0.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-129",
        "CWE-787"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52786.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

289b90d8d109b00594667a82007255bb71b36a6b

Fixed

3a74c74a8139526e34da32c6cc41ed7c71aaded5

Fixed

9bc3cfa07aab98852de432fa24079f4b4b6b7eed

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.4.5"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.5.1"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.6.0"
                }
            ],
            "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-1.4.3

bacnet-stack-1.4.4

bacnet-stack-1.5.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52786.json"