CVE-2026-44639

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Source
https://cve.org/CVERecord?id=CVE-2026-44639
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44639.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-44639
Aliases
  • GHSA-6mwg-445v-2qrv
Published
2026-09-18T16:17:56Z
Modified
2026-09-20T14:24:43Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
NanoMQ: O(N²) Denial of Service in MQTT v5 Property Parsing
Details

NanoMQ is an MQTT broker. Prior to 0.24.14, NanoMQ's MQTT v5 property decoder in nng/src/supplemental/mqtt/mqtt_codec.c uses property_append() to walk the entire linked list for each property added by decode_buf_properties(). A remote unauthenticated client can supply a PUBLISH or SUBSCRIBE packet containing many User Properties, causing O(N²) linked-list insertion and CPU work that makes the broker unresponsive; repeated packets can sustain the denial of service. This issue is fixed in version 0.24.14.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44639.json"
}
References

Affected packages

Git / github.com/nanomq/nanomq

Affected ranges

Type
GIT
Repo
https://github.com/nanomq/nanomq
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
16bdb38921e7bbeab887cf229c2eb145889dfa88
Database specific
Show details 
{
    "source": "REFERENCES"
}
Type
GIT
Repo
https://github.com/nanomq/nanonng
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
91bd4c7f45f945a3f5f0e37c459157dc7c277a07
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.24.14"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.0.1
0.0.2
0.0.3
0.1.0
0.10.1
0.10.5
0.10.8
0.11.0
0.11.2
0.11.3
0.11.5
0.11.8
0.11.82
0.12.0
0.12.1
0.12.2
0.12.5
0.13
0.13.0
0.13.5
0.13.6
0.13.8
0.14.0
0.14.1
0.14.5
0.14.8
0.15.0
0.15.1
0.15.2
0.15.3
0.15.5
0.16.0
0.16.2
0.16.3
0.16.5
0.17.0
0.17.2
0.17.5
0.17.8
0.18.1
0.18.2
0.19.0
0.19.1
0.19.5
0.2.0
0.2.1
0.2.2
0.2.5
0.20.0
0.20.5
0.20.6
0.20.8
0.21
0.21.1
0.21.10
0.21.2
0.21.5
0.21.6
0.21.7
0.21.8
0.21.9
0.22.0
0.22.1
0.22.10
0.22.2
0.22.3
0.22.4
0.22.6
0.22.7
0.22.8
0.23.0
0.23.1
0.23.10
0.23.2
0.23.3
0.23.4
0.23.5
0.23.6
0.23.7
0.23.7-11
0.23.8
0.23.9
0.24.0
0.24.1
0.24.10
0.24.11
0.24.11-sdv
0.24.12
0.24.13
0.24.2
0.24.3
0.24.3-5
0.24.4
0.24.5
0.24.6
0.24.7
0.24.8
0.24.9
0.3.0
0.3.2
0.3.3
0.3.4
0.3.5
0.3.8
0.4.0
0.4.1
0.4.2
0.4.3
0.4.5
0.4.8
0.5.0
0.5.2
0.5.5
0.5.8
0.5.9
0.6.0
0.6.2
0.6.3
0.6.4
0.6.7rc
0.6.8
0.7.0
0.7.2
0.7.3
0.7.4
0.7.4rc
0.7.5
0.7.5rc
0.7.8
0.7.9
0.8.0
0.8.3
0.8.5
0.8.6log
0.9.0
0.9.2
0.9.5
0.9.7

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44639.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "function_hash": "28834888792585952746046582344763331937",
            "length": 1283
        },
        "id": "CVE-2026-44639-12dab8c8",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/nanomq/nanonng/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07",
        "target": {
            "file": "src/supplemental/mqtt/mqtt_codec.c",
            "function": "property_dup"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "36706445640004850427928606781114042144",
            "length": 1121
        },
        "id": "CVE-2026-44639-2294d8d3",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/nanomq/nanonng/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07",
        "target": {
            "file": "src/supplemental/mqtt/mqtt_codec.c",
            "function": "decode_buf_properties"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "46811483451477896856790388328605763754",
                "311801283924213688732307939793063194875",
                "87677047326685687221320160440381353259",
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                "76961446226926196609329045329125456353",
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                "219560342882905124898457963778654768058",
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                "71594525974957365475092236729829622801",
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                "214057169666744023519760494290836972471",
                "193126897144187975916033350119924395008",
                "283177173388909815992744418798404544788"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-44639-30e55c08",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/nanomq/nanonng/commit/91bd4c7f45f945a3f5f0e37c459157dc7c277a07",
        "target": {
            "file": "src/supplemental/mqtt/mqtt_codec.c"
        }
    }
]
vanir_signatures_modified 
"2026-09-20T14:24:43Z"