CVE-2026-13491
78 xiaozhi-esp32 MQTT Goodbye mqtt_protocol.cc GetInstance denial of service
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.
INFO
Published Date :
June 28, 2026, 12:17 p.m.
Last Modified :
June 29, 2026, 6:43 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 2.0 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | [email protected] | ||||
| CVSS 4.0 | LOW | [email protected] |
Solution
- Apply the provided patch e182471f8c5a22434346bd98da34d3b66c8c8b3e.
- Update the 78 xiaozhi-esp32 firmware to version 2.2.7 or later.
- Monitor network traffic for suspicious MQTT activity.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-13491.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-13491 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-13491
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-13491 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-13491 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 29, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-13491', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-29T12:28:44.324743Z'} -
New CVE Received by [email protected]
Jun. 28, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:78:xiaozhi-esp32:*:*:*:*:*:*:*:*'], 'vendor': '78', 'modules': ['MQTT Goodbye Handler'], 'product': 'xiaozhi-esp32', 'versions': [{'status': 'affected', 'version': '2.2.0'}, {'status': 'affected', 'version': '2.2.1'}, {'status': 'affected', 'version': '2.2.2'}, {'status': 'affected', 'version': '2.2.3'}, {'status': 'affected', 'version': '2.2.4'}, {'status': 'affected', 'version': '2.2.5'}, {'status': 'affected', 'version': '2.2.6'}]}] Added 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. Added CVSS V4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Added CVSS V2 (AV:N/AC:H/Au:N/C:N/I:N/A:P) Added CWE CWE-404 Added Reference https://github.com/78/xiaozhi-esp32/ Added Reference https://github.com/78/xiaozhi-esp32/commit/e182471f8c5a22434346bd98da34d3b66c8c8b3e Added Reference https://github.com/78/xiaozhi-esp32/issues/2022 Added Reference https://github.com/78/xiaozhi-esp32/pull/2023 Added Reference https://vuldb.com/cve/CVE-2026-13491 Added Reference https://vuldb.com/submit/838439 Added Reference https://vuldb.com/vuln/374488 Added Reference https://vuldb.com/vuln/374488/cti