How severe is CVE-2025-59946?

CVE-2025-59946 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-59946 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59946?

CVE-2025-59946 affects Emqx Nanomq. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59946?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-59946 have an EU (EUVD) identifier?

Yes. CVE-2025-59946 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205461.

When was CVE-2025-59946 published?

CVE-2025-59946 was published on 2025-12-27 and last updated on 2026-06-17.

CVE-2025-59946

CVE-2025-59946 is a high-severity vulnerability in Emqx Nanomq with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205461
Weakness: CWE-416
Affected product: Emqx Nanomq
Published: 2025-12-27
Last modified: 2026-06-17

Description

NanoMQ MQTT Broker (NanoMQ) is an Edge Messaging Platform. Prior to version 0.24.2, there is a classical data racing issue about sub info list which could result in heap use after free crash. This issue has been patched in version 0.24.2.

Frequently asked questions

What is CVE-2025-59946?: NanoMQ MQTT Broker (NanoMQ) is an Edge Messaging Platform. Prior to version 0.24.2, there is a classical data racing issue about sub info list which could result in heap use after free crash. This issue has been patched in version 0.24.2.
How severe is CVE-2025-59946?: CVE-2025-59946 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-59946 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59946?: CVE-2025-59946 affects Emqx Nanomq. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59946?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-59946 have an EU (EUVD) identifier?: Yes. CVE-2025-59946 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205461.
When was CVE-2025-59946 published?: CVE-2025-59946 was published on 2025-12-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:emqx:nanomq:*:*:*:*:*:*:*:*

More vulnerabilities in Emqx Nanomq

CVE-2025-59947 — Critical (CVSS 9.0): NanoMQ is a messaging broker/bus for IoT Edge & SDV. Versions prior to 0.24.4 have a buffer overflow case while the…
CVE-2024-42655 — High (CVSS 8.8): An access control issue in NanoMQ v0.21.10 allows attackers to bypass security restrictions and access sensitive system…
CVE-2023-34488 — High (CVSS 7.8): NanoMQ 0.17.5 has a one-byte heap-based buffer over-read in the conn_handler function of mqtt_parser.c when it…
CVE-2026-32135 — High (CVSS 7.5): NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Versions prior to 0.24.11 have a remotely…
CVE-2026-21888 — High (CVSS 7.5): NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing…
CVE-2024-48077 — High (CVSS 7.5): NanoMQ v0.22.7 is vulnerable to Denial of Service (DoS) due to improper resource throttling. A crafted sequence of…

All CVEs affecting Emqx Nanomq →

Other CWE-416 (Use After Free) vulnerabilities

CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

Browse all CWE-416 (Use After Free) vulnerabilities →