CVE-2024-10525: Eclipse Mosquito: Heap Buffer Overflow in my_subscribe_callback

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 59.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2024-10-30 · updated 2026-06-17
Weakness: CWE-122

Description

In Eclipse Mosquitto, from version 1.3.2 through 2.0.18, if a malicious broker sends a crafted SUBACK packet with no reason codes, a client using libmosquitto may make out of bounds memory access when acting in its on_subscribe callback. This affects the mosquitto_sub and mosquitto_rr clients.

Affected products

The Eclipse Foundation Eclipse Mosquitto: from 1.3.2 before 2.0.19 — fixed in 2.0.19

How to fix

Upgrade to a fixed version: The Eclipse Foundation Eclipse Mosquitto 2.0.19. Check the vendor advisory for mitigations.

References

https://github.com/eclipse-mosquitto/mosquitto/commit/8ab20b4ba4204fdcdec78cb4d9f03c944a6e0e1c
https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/190
https://mosquitto.org/blog/2024/10/version-2-0-19-released/
https://lists.debian.org/debian-lts-announce/2025/02/msg00022.html

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