CVE-2021-41036: Eclipse Paho Mqtt C/c++ Client

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

In versions prior to 1.1 of the Eclipse Paho MQTT C Client, the client does not check rem_len size in readpacket.

Affected products

• Eclipse Paho Mqtt C/c++ Client: before 1.1.0 (fixed in 1.1.0)

Published 2021-11-03. Last modified 2026-06-17.