What’s Vulnerable › Vulnerabilities

CVE-2026-13491: 78 xiaozhi-esp32 MQTT Goodbye mqtt_protocol.cc GetInstance denial of service

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-28 · updated 2026-10-25
• Weakness: CWE-404

Description

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.

Affected products

• 78 xiaozhi-esp32: 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5 (+1)

References

• https://github.com/78/xiaozhi-esp32/
• https://github.com/78/xiaozhi-esp32/commit/e182471f8c5a22434346bd98da34d3b66c8c8b3e
• https://github.com/78/xiaozhi-esp32/issues/2022
• https://github.com/78/xiaozhi-esp32/pull/2023
• https://vuldb.com/cve/CVE-2026-13491
• https://vuldb.com/submit/838439
• https://vuldb.com/vuln/374488
• https://vuldb.com/vuln/374488/cti

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