ALPINE-CVE-2023-28366 — Vulnetix

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ALPINE-CVE-2023-28366 PUBLISHED CVSS 7.5 HIGH

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.

Risk Scores

CVSS v3.1

7.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
Alpine:v3.22	mosquitto	0, 2.0.9-r1, 2.0.9-r0
Alpine:v3.21	mosquitto	1.2.2-r0, 2.0.9-r1, 2.0.9-r0
Alpine:v3.19	mosquitto	0, 2.0.9-r1, 2.0.9-r0
Alpine:v3.18	mosquitto	2.0.9-r1, 0, 1.2.2-r0
Alpine:v3.20	mosquitto	1.6.1-r0, 2.0.9-r1, 2.0.9-r0
Alpine:v3.23	mosquitto	2.0.9-r1, 1.2.2-r0, 1.2.2-r1

Timeline

Sep 1, 2023 CVE Published
Dec 3, 2025 CVE Updated
Apr 30, 2026 Distribution Patch

References

https://security.alpinelinux.org/vuln/CVE-2023-28366 advisory

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