CVE-2026-13491 78 xiaozhi-esp32 MQTT Goodbye mqtt_protocol.cc GetInstance denial of service
Remote attackers can cause denial of service in xiaozhi-esp32 devices by manipulating the session_id argument in the MQTT Goodbye Handler.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-13491?
CVE-2026-13491 is a medium-severity denial of service vulnerability in 78 xiaozhi-esp32, published on 28 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-404
Which versions are affected by CVE-2026-13491?
How do I fix CVE-2026-13491?
No fix has been published for CVE-2026-13491 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-13491 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13491 exists.
Sources
Also known as GHSA-rwf9-x45x-533w.