CVE-2025-68699

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Source
https://cve.org/CVERecord?id=CVE-2025-68699
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68699.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2025-68699
Aliases
  • GHSA-qv5f-c6v2-2f8h
Published
2026-02-04T19:25:12.716Z
Modified
2026-03-13T03:49:25.830482Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
Summary
NanoMQ $share/ Subscription Validation and Forwarding Parsing Inconsistency: NULL Pointer Increment Causes Crash
Details

NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, NanoMQ has a protocol parsing / forwarding inconsistency when handling shared subscriptions ($share/). A malformed SUBSCRIBE topic such as $share/ab (missing the second /) is not strictly validated during the subscription stage, so the invalid Topic Filter is stored into the subscription table. Later, when any PUBLISH matches this subscription, the broker send path (nmqpipesendstartv4/v5) performs a second $share/ parsing using strchr() and increments the returned pointer without NULL checks. If the second strchr() returns NULL, subtopic++ turns the pointer into an invalid address (e.g. 0x1). This invalid pointer is then passed into topicfiltern(), which triggers strlen() and crashes with SIGSEGV. The crash is stable and remotely triggerable. This issue has been patched in version 0.24.7.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-476"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68699.json"
}
References

Affected packages

Git / github.com/emqx/nanomq

Affected ranges

Type
GIT
Repo
https://github.com/emqx/nanomq
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last affected
dc3a3136cd82d5c005b8cd26a65fe53beaaf0eb9
Database specific 
{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "0.24.6"
        }
    ]
}

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
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
0.17.2
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
0.22.6
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
0.24.2
0.24.3
0.24.3-5
0.24.4
0.24.5
0.24.6
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-2025-68699.json"

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
89d68d678e7f841ae7baa45cba8d9bc7ddc9ef4b

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
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
0.17.2
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
0.22.6
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
0.24.2
0.24.3
0.24.3-5
0.24.4
0.24.5
0.24.6
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

vanir_signatures 
[
    {
        "signature_type": "Function",
        "deprecated": false,
        "id": "CVE-2025-68699-65738b67",
        "target": {
            "file": "nanomq/sub_handler.c",
            "function": "decode_sub_msg"
        },
        "digest": {
            "length": 3400.0,
            "function_hash": "310497582721063528643753849206017306310"
        },
        "signature_version": "v1",
        "source": "https://github.com/nanomq/nanomq/commit/89d68d678e7f841ae7baa45cba8d9bc7ddc9ef4b"
    },
    {
        "signature_type": "Line",
        "deprecated": false,
        "id": "CVE-2025-68699-fe3008e0",
        "target": {
            "file": "nanomq/sub_handler.c"
        },
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "148264463702639014445328608625644980351",
                "117947634385951628594612798951377727625",
                "41346191352829948806448050848932223453",
                "229002528819622269653400236844159766664",
                "285738955883243541372447950489972748231",
                "153811760593078631432581308123868832465",
                "136285553792020661809863699701129605377",
                "174054833792398501351385306226073447586"
            ]
        },
        "signature_version": "v1",
        "source": "https://github.com/nanomq/nanomq/commit/89d68d678e7f841ae7baa45cba8d9bc7ddc9ef4b"
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-68699.json"