CVE-2026-26264

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Source

https://cve.org/CVERecord?id=CVE-2026-26264

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26264.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-26264

Aliases

GHSA-phjh-v45p-gmjj

Published

2026-02-13T18:14:30Z

Modified

2026-08-12T15:32:00Z

Severity

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

Summary

BACnet Stack WriteProperty decoding length underflow leads to OOB read and crash

Details

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0rc4 and 1.4.3rc2, a malformed WriteProperty request can trigger a length underflow in the BACnet stack, leading to an out‑of‑bounds read and a crash (DoS). The issue is in wp.c within wp_decode_service_request. When decoding the optional priority context tag, the code passes apdu_len - apdu_size to bacnet_unsigned_context_decode without validating that apdu_size <= apdu_len. If a truncated APDU reaches this path, apdu_len - apdu_size underflows, resulting in a large size being used for decoding and an out‑of‑bounds read. This vulnerability is fixed in 1.5.0rc4 and 1.4.3rc2.

Database specific

{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26264.json",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "1.5.0rc1"
                },
                {
                    "fixed": "1.5.0rc4"
                },
                {
                    "fixed": "1.4.3rc2"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}

References

Affected packages

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

Affected ranges

Type

GIT

Repo

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

Events

Introduced

f332225b196aa66503faae64f92bef113fe89ab2

Fixed

6d2d251ca4f4d932664add702b236279863d630a

Fixed

4cc8067c86f26e2b08b2c8f4d27f8e07de4d4708

Database specific

Show details

{
    "cpe": "cpe:2.3:a:bacnetstack:bacnet_stack:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "1.4.0"
        },
        {
            "fixed": "1.4.3"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

bacnet-stack-1.*

bacnet-stack-1.4.0

bacnet-stack-1.4.1

bacnet-stack-1.4.2

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26264.json"

vanir_signatures

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        },
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        "target": {
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        }
    },
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        "target": {
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    }
]

vanir_signatures_modified

"2026-08-12T15:32:00Z"