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

2026-02-13T18:14:30.232Z

Modified

2026-02-20T02:26:30.679229Z

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 wpdecodeservicerequest. When decoding the optional priority context tag, the code passes apdulen - apdusize to bacnetunsignedcontextdecode without validating that apdusize <= apdulen. If a truncated APDU reaches this path, apdulen - apdusize 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

{
    "cwe_ids": [
        "CWE-125"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26264.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

0 Unknown introduced commit / All previous commits are affected

Fixed

4cc8067c86f26e2b08b2c8f4d27f8e07de4d4708

Introduced

f332225b196aa66503faae64f92bef113fe89ab2

Fixed

4cc8067c86f26e2b08b2c8f4d27f8e07de4d4708

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

[
    {
        "deprecated": false,
        "signature_version": "v1",
        "digest": {
            "function_hash": "334356809919514516432083377056186192478",
            "length": 1934.0
        },
        "source": "https://github.com/bacnet-stack/bacnet-stack/commit/4cc8067c86f26e2b08b2c8f4d27f8e07de4d4708",
        "signature_type": "Function",
        "id": "CVE-2026-26264-12a0c9e5",
        "target": {
            "file": "src/bacnet/wp.c",
            "function": "wp_decode_service_request"
        }
    },
    {
        "deprecated": false,
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
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        },
        "source": "https://github.com/bacnet-stack/bacnet-stack/commit/4cc8067c86f26e2b08b2c8f4d27f8e07de4d4708",
        "signature_type": "Line",
        "id": "CVE-2026-26264-3590fc09",
        "target": {
            "file": "src/bacnet/bacaction.c"
        }
    },
    {
        "deprecated": false,
        "signature_version": "v1",
        "digest": {
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        },
        "source": "https://github.com/bacnet-stack/bacnet-stack/commit/4cc8067c86f26e2b08b2c8f4d27f8e07de4d4708",
        "signature_type": "Function",
        "id": "CVE-2026-26264-497dd425",
        "target": {
            "file": "src/bacnet/bacaction.c",
            "function": "bacnet_action_command_decode"
        }
    },
    {
        "deprecated": false,
        "signature_version": "v1",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
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        },
        "source": "https://github.com/bacnet-stack/bacnet-stack/commit/4cc8067c86f26e2b08b2c8f4d27f8e07de4d4708",
        "signature_type": "Line",
        "id": "CVE-2026-26264-a2eaba25",
        "target": {
            "file": "src/bacnet/wp.c"
        }
    }
]