CVE-2026-13491 PUBLISHED

A vulnerability was detected in 78 xiaozhi-esp32 up to 2.2.6. This vulnerability affects the function Application::GetInstance of the file main/protocols/mqtt_protocol.cc of the component MQTT Goodbye Handler. Performing a manipulation of the argument session_id results in denial of service. The attack is possible to be carried out remotely. The complexity of an attack is rather high. It is stated that the exploitability is difficult. The exploit is now public and may be used. The patch is named e182471f8c5a22434346bd98da34d3b66c8c8b3e. It is recommended to apply a patch to fix this issue.

• dem0000 (VulDB User) reporter

• VDB-374488 | 78 xiaozhi-esp32 MQTT Goodbye mqtt_protocol.cc GetInstance denial of service
• VDB-374488 | CTI Indicators (IOB, IOC, TTP, IOA)
• CVE-2026-13491 | CVE Analysis and Report
• Submit #838439 | 78 xiaozhi-esp32 2aeecd4e014780ac15cfa4866906cca16267010d Denial of Service
• https://github.com/78/xiaozhi-esp32/issues/2022
• https://github.com/78/xiaozhi-esp32/pull/2023
• https://github.com/78/xiaozhi-esp32/commit/e182471f8c5a22434346bd98da34d3b66c8c8b3e
• https://github.com/78/xiaozhi-esp32/

• Denial of Service CWE