Denial of Service Vulnerability in MQTT Goodbye Handler of 78 Xiaozhi-ESP32
CVE-2026-13491

6.3MEDIUM

Key Information:

Vendor

78

Status
Xiaozhi-esp32
Vendor
CVE Published:
28 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-13491?

A vulnerability has been identified in the 78 xiaozhi-esp32 product regarding the MQTT Goodbye Handler. It allows for remote exploitation, where manipulated arguments to the GetInstance function can lead to a denial of service. This exploit presents a significant risk as it is publicly available and can be complex to execute. Users are strongly encouraged to update to the latest patched version to mitigate this vulnerability.

Affected Version(s)

xiaozhi-esp32 2.2.0

xiaozhi-esp32 2.2.1

xiaozhi-esp32 2.2.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-13491 - Proof of Concept

References

https://vuldb.com/vuln/374488
vdb-entrytechnical-description
https://vuldb.com/vuln/374488/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-13491
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

dem0000 (VulDB User)
.