# CVE-2023-28366: mosquitto: The broker in Eclipse Mosquitto 1.3.2 through 2.x before 2.0.16 has a memory leak that can be abused remotely when a...

CVE-2023-28366 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2023-28366, released September 1, 2023. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-28366
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0131
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 1, 2023

## Description

The broker in Eclipse Mosquitto 1.3.2 through 2.x before 2.0.16 has a memory leak that can be abused remotely when a client sends many QoS 2 messages with duplicate message IDs, and fails to respond to PUBREC commands. This occurs because of mishandling of EAGAIN from the libc send function.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libmosquitto1 Ubuntu 22.04.1 LTS (jammy) | 2.0.11-1ubuntu1.1 | [libmosquitto1 2.0.11-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libmosquitto1-2.0.11-1ubuntu1.1.md) | Oct 2, 2023 |
| Linux | libmosquittopp1 Ubuntu 22.04.1 LTS (jammy) | 2.0.11-1ubuntu1.1 | [libmosquittopp1 2.0.11-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libmosquittopp1-2.0.11-1ubuntu1.1.md) | Oct 2, 2023 |
| Linux | mosquitto Debian 12.15 (bookworm) | 2.0.11-1.2+deb12u1 | [DEBIAN-CVE-2023-28366](https://patchblox.com/security/data/fix/linux/debian-cve-2023-28366.md) | Sep 1, 2023 |
| Linux | mosquitto Debian 13.5 (trixie) | 2.0.17-1 | [DEBIAN-CVE-2023-28366](https://patchblox.com/security/data/fix/linux/debian-cve-2023-28366.md) | Sep 1, 2023 |
| Linux | mosquitto Debian 14 | 2.0.17-1 | [DEBIAN-CVE-2023-28366](https://patchblox.com/security/data/fix/linux/debian-cve-2023-28366.md) | Sep 1, 2023 |
| Linux | mosquitto Ubuntu 22.04.1 LTS (jammy) | 2.0.11-1ubuntu1.1 | [mosquitto 2.0.11-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mosquitto-2.0.11-1ubuntu1.1.md) | Oct 2, 2023 |
| Linux | mosquitto-clients Ubuntu 22.04.1 LTS (jammy) | 2.0.11-1ubuntu1.1 | [mosquitto-clients 2.0.11-1ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-mosquitto-clients-2.0.11-1ubuntu1.1.md) | Oct 2, 2023 |

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Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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