# CVE-2024-8376: Memory leak

> Attackers can trigger memory leaks, crashes, or heap-use-after-free in Eclipse Mosquitto by sending specific MQTT packet sequences.

- **Severity:** High 7.2 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 11 Oct 2024
- **Updated:** 31 Oct 2024
- **Also known as:** BELL-CVE-2024-8376, DEBIAN-CVE-2024-8376, GHSA-72qw-2vp3-gvg9, OESA-2024-2415, OESA-2024-2416, OESA-2024-2417, OESA-2024-2418, ROOT-OS-ALPINE-320-CVE-2024-8376, UBUNTU-CVE-2024-8376

## What is CVE-2024-8376?

CVE-2024-8376 is a high-severity use after free vulnerability in Eclipse Foundation Mosquitto, published on 11 Oct 2024. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

In Eclipse Mosquitto up to version 2.0.18a, an attacker can achieve memory leaking, segmentation fault or heap-use-after-free by sending specific sequences of "CONNECT", "DISCONNECT", "SUBSCRIBE", "UNSUBSCRIBE" and "PUBLISH" packets.

Weakness: CWE-755 (Improper Handling of Exceptional Conditions), CWE-416 (Use After Free), CWE-401 (Missing Release of Memory after Effective Lifetime)

## Which versions are affected by CVE-2024-8376?

It affects 1 product.


Products: Eclipse Mosquitto.

## How do I fix CVE-2024-8376?

Apply the vendor's patch.

## Is CVE-2024-8376 being exploited?

There is no known exploitation of CVE-2024-8376 in the wild and no public exploit code.

## Other vulnerabilities in Eclipse Foundation Mosquitto

- [CVE-2018-12550](https://insights.sbomify.com/CVE-2018-12550/): Auth bypass in Eclipse Mosquitto (high 8.1)
- [CVE-2018-12551](https://insights.sbomify.com/CVE-2018-12551/): Auth bypass in Eclipse Mosquitto (high 8.1)
- [CVE-2023-5632](https://insights.sbomify.com/CVE-2023-5632/): Unconditionally adding an event to the epoll causes excessive CPU consumption (high 7.5)
- [CVE-2023-28366](https://insights.sbomify.com/CVE-2023-28366/): Denial of service in n/a (high 7.5)
- [CVE-2021-41039](https://insights.sbomify.com/CVE-2021-41039/): Denial of service in Eclipse Mosquitto (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-8376 and fix it if it is affected.

What it is: CVE-2024-8376 is a high-severity use after free vulnerability in Eclipse Foundation Mosquitto, published on 11 Oct 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-8376 in the wild and no public exploit code.

Affected product: Eclipse Foundation Mosquitto. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2024-8376/ (Markdown: https://insights.sbomify.com/CVE-2024-8376/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-8376
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-8376
- OSV: https://osv.dev/vulnerability/CVE-2024-8376

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-8376/
Summaries are generated and may contain mistakes; the official description above is the record.