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
2026-09-19T08:14:24Z
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/nanonng

Affected ranges

Type
GIT
Repo
https://github.com/nanomq/nanonng
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
5c6ad09f0f6f0b111e19e8fbae259d20f5673505
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.24.14"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

0.*
0.11.5
0.11.8
0.13
0.13.5
0.14.5
0.15.3
0.15.5
0.16.0
0.16.3
0.16.5
0.17.0
0.17.2
0.17.8
0.18.2
0.19.1
0.20.0
0.20.5
0.20.8
0.21
0.21.2
0.21.5
0.21.6
0.21.8
0.21.9
0.22.0
0.22.1
0.22.10
0.22.2
0.22.4
0.22.6
0.22.8
0.23.1
0.23.10
0.23.2
0.23.3
0.23.5
0.23.7
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
0.24.5
0.24.6
0.24.7
0.24.8
0.7.2
0.8.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44639.json"
vanir_signatures 
[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "106732617879992299546335078856304780455",
                "294493632223967332579844525831444462468",
                "206181698616916517217061310250512270723",
                "76067159830892398620980420349741433411",
                "132925112758583824193369990132482553455",
                "55370608497300193109260551169647432186",
                "81972049601563662899808688096955314759",
                "238044452542881528069518046016055915863"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-44639-1eff8815",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/nanomq/nanonng/commit/5c6ad09f0f6f0b111e19e8fbae259d20f5673505",
        "target": {
            "file": "src/supplemental/nanolib/conf.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "179704196006112879465033474608620449237",
            "length": 3859
        },
        "id": "CVE-2026-44639-bc6d51d1",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/nanomq/nanonng/commit/5c6ad09f0f6f0b111e19e8fbae259d20f5673505",
        "target": {
            "file": "src/supplemental/nanolib/conf.c",
            "function": "conf_bridge_node_destroy"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "319987710299103814133658779126207238492",
                "70208850574568910157760390157809152789",
                "191324800489073211161864177168034711983",
                "282085166627322855677257736944132808316",
                "295813053496134856364453543700627648562"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-44639-cdd8af0f",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/nanomq/nanonng/commit/5c6ad09f0f6f0b111e19e8fbae259d20f5673505",
        "target": {
            "file": "include/nng/supplemental/nanolib/conf.h"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "60028838494314808152959761740048073868",
            "length": 1512
        },
        "id": "CVE-2026-44639-fd363509",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/nanomq/nanonng/commit/5c6ad09f0f6f0b111e19e8fbae259d20f5673505",
        "target": {
            "file": "src/supplemental/nanolib/conf.c",
            "function": "conf_bridge_node_init"
        }
    }
]
vanir_signatures_modified 
"2026-09-19T08:14:24Z"