Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
78 xiaozhi-esp32
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xiaoxia An MCP-based Chatbot是Xiaoxia个人开发者的一个基于MCP的聊天机器人软件。 Xiaoxia An MCP-based Chatbot 2.2.6及之前版本存在资源管理错误漏洞，该漏洞源于MQTT Goodbye Handler组件中文件main/protocols/mqtt_protocol.cc的函数Application::GetInstance对session_id参数操作不当，可能导致拒绝服务。

CVSS 3.7 · Low EPSS 0.62% · P48

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 7

VendorProduct Version RangeStatus
78 xiaozhi-esp32 2.2.0 affected
2.2.1 affected
2.2.2 affected
2.2.3 affected
2.2.4 affected
2.2.5 affected
2.2.6 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-13491

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
78 xiaozhi-esp32 MQTT Goodbye mqtt_protocol.cc GetInstance denial of service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当的资源关闭或释放
Source: CVE Program / CVE List V5
Vulnerability Title
Xiaoxia An MCP-based Chatbot 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xiaoxia An MCP-based Chatbot是Xiaoxia个人开发者的一个基于MCP的聊天机器人软件。 Xiaoxia An MCP-based Chatbot 2.2.6及之前版本存在资源管理错误漏洞，该漏洞源于MQTT Goodbye Handler组件中文件main/protocols/mqtt_protocol.cc的函数Application::GetInstance对session_id参数操作不当，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
78 xiaozhi-esp32 2.2.0 cpe:2.3:a:78:xiaozhi-esp32:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-13491

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-13491

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-13491 (2)

Other References for CVE-2026-13491 (2)

IV. Related Vulnerabilities

Same product: xiaozhi-esp32
Same vendor: 78
Same weakness: CWE-404

V. Comments for CVE-2026-13491

No comments yet

Leave a comment