CVE-2025-10543

A flaw was found in paho.mqtt.golang. This vulnerability allows data leakage and packet corruption via malformed UTF-8 (Unicode Transformation Format - 8-bit) encoded strings exceeding 65535 bytes due to an integer overflow.

This vulnerability is rated Moderate for Red Hat. It affects applications utilizing the paho.mqtt.golang library that process UTF-8 encoded strings exceeding 65535 bytes. This uncommon scenario can lead to data leakage within MQTT packets, such as a topic inadvertently appearing in the message body.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.