Nanomq
CVE-2025-68699
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A10:2025 - Mishandling of Exceptional Conditions
ASVS 5.0
V16 - Security Logging and Error Handling Null pointer safety, defensive checks
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 6.5 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: Required. Exploitable via remote/network. Public exploit/POC available. |
| Exploit ScenarioDerived | A remote attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
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 ($share/). [CVSS 6.5 MEDIUM]
RemediationAI
A vendor patch is available — apply it immediately. Fixed in version 0.24.7.. Restrict network access to the affected service where possible.
Affects your stack
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Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-476 (NULL Pointer Dereference). Affects Nanomq. NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, NanoMQ has a protocol parsing / forwarding inconsistency when handling shared subscriptions ($share/). A malformed SUBSCRIBE topic such as $share/ab (missing the second /) is not strictly validated during the subscription stage, so the invalid Topic Filter is stored into the subscription table. Later, when any PUBLISH matches this subscription, the broker send path (nmq_pipe_send_start_v4/v5) performs a seco
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
3DescriptionGitHub Advisory
NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, NanoMQ has a protocol parsing / forwarding inconsistency when handling shared subscriptions ($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 (nmq_pipe_send_start_v4/v5) performs a second $share/ parsing using strchr() and increments the returned pointer without NULL checks. If the second strchr() returns NULL, sub_topic++ turns the pointer into an invalid address (e.g. 0x1). This invalid pointer is then passed into topic_filtern(), which triggers strlen() and crashes with SIGSEGV. The crash is stable and remotely triggerable. This issue has been patched in version 0.24.7.
Executive ViewAI
CVE-2025-68699 presents notable security risk, a null pointer dereference vulnerability rated CVSS 6.5. Exploitation could compromise the security of affected deployments. Proof-of-concept code is publicly available. A patch is available and should be applied during regular vulnerability management.
Apply vendor patch. If patching is delayed: enable ASLR/DEP, apply network segmentation.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)GitHub Advisory
NanoMQ 0.17.5 has a one-byte heap-based buffer over-read in the conn_handler function of mqtt_parser.c when it processes
CVE-2024-42646 is a segmentation fault vulnerability in NanoMQ v0.21.10 that allows unauthenticated remote attackers to
A data race in NanoMQ MQTT Broker versions prior to 0.24.2 can free subscription-info list memory while another thread s
Null Pointer Dereference vulnerability in topic_filtern function in mqtt_parser.c in NanoMQ 0.21.7 allows attackers to c
A use-after-free vulnerability exists in NanoMQ 0.17.2. Rated high severity (CVSS 7.5), this vulnerability is remotely e
A heap buffer overflow vulnerability exists in NanoMQ 0.17.2. Rated high severity (CVSS 7.5), this vulnerability is remo
A heap buffer overflow vulnerability exists in NanoMQ 0.17.2. Rated high severity (CVSS 7.5), this vulnerability is remo
A heap buffer overflow vulnerability exists in NanoMQ 0.17.2. Rated high severity (CVSS 7.5), this vulnerability is remo
In NanoMQ v0.15.0-0, segment fault with Null Pointer Dereference occurs in the process of decoding subinfo_decode and un
In NanoMQ v0.15.0-0, a Heap overflow occurs in copyn_utf8_str function of mqtt_parser.c. Rated high severity (CVSS 7.5),
In NanoMQ v0.15.0-0, Heap overflow occurs in read_byte function of mqtt_code.c. Rated high severity (CVSS 7.5), this vul
A heap-buffer-overflow vulnerability in the read_byte function in NanoMQ v.0.21.7 allows attackers to cause a denial of
Exploit-DB