Use After Free in Emqx Nanomq
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (29.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Emqx Nanomq
- Nanomq — versions < 0.24.4
Weakness classification (CWE)
References
- github.com/nanomq/nanomq/security/advisories/GHSA-xg37-23w7-72p5 (Vendor Advisory)
- github.com/nanomq/nanomq/issues/1863 (Exploit, Issue Tracking)
Frequently asked questions
- What is CVE-2025-59946?
- CVE-2025-59946 is a high-severity vulnerability in Emqx Nanomq, classified under Use After Free. CVSS score: 7.5/10. Published 2025-12-27.
- How severe is CVE-2025-59946?
- High severity. CVSS v3 base score is 7.5 out of 10.