CVE-2026-13489 in xiaozhi-esp32
Summary
by MITRE • 06/28/2026
A weakness has been identified in 78 xiaozhi-esp32 up to 2.2.6. Affected by this issue is the function ParseMessage of the file main/mcp_server.cc of the component MCP Response Handler. This manipulation causes improper synchronization. Remote exploitation of the attack is possible. The attack's complexity is rated as high. The exploitation is known to be difficult. The exploit has been made available to the public and could be used for attacks. The pull request to fix this issue awaits acceptance.
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Analysis
by VulDB Data Team • 06/30/2026
This vulnerability resides within the xiaozhi-esp32 firmware version 2.2.6 and earlier, specifically targeting the MCP Response Handler component. The flaw manifests in the ParseMessage function located in main/mcp_server.cc, representing a critical synchronization issue that fundamentally compromises the system's integrity. The weakness allows for improper handling of concurrent operations, creating potential race conditions and data corruption scenarios within the embedded device framework.
The technical nature of this vulnerability aligns with CWE-362, which describes concurrent execution using improper synchronization mechanisms. The affected ParseMessage function fails to properly manage shared resources during message processing, enabling malicious actors to manipulate the system's operational flow through carefully crafted remote inputs. This improper synchronization creates a pathway for attackers to disrupt normal system operations and potentially gain unauthorized control over device functions.
Remote exploitation of this vulnerability presents significant operational risks given the embedded nature of the xiaozhi-esp32 devices. The high attack complexity rating indicates that while not trivial, successful exploitation is achievable by determined adversaries who understand the underlying system architecture. The public availability of exploit code further elevates the threat level, as it removes the barrier to entry for potential attackers who may leverage existing tools or modify them for specific targets. This vulnerability particularly affects IoT deployments where these devices operate in networked environments.
The impact extends beyond simple functionality disruption to encompass potential data compromise and unauthorized access to connected systems. Attackers could exploit this flaw to inject malicious commands, manipulate device responses, or create persistent backdoors within the network infrastructure. The vulnerability's presence in an embedded system component means that exploitation could affect not just individual devices but entire networks of interconnected IoT devices. Organizations deploying these systems should consider the broader implications for their security posture and network architecture.
Mitigation strategies should prioritize immediate firmware updates once the official patch becomes available, as indicated by the pending pull request. Network segmentation and monitoring should be implemented to detect anomalous behavior patterns that might indicate exploitation attempts. Access controls and authentication mechanisms should be strengthened around affected devices, while regular security assessments should be conducted to identify similar vulnerabilities in other embedded components. The vulnerability highlights the importance of proper synchronization mechanisms in embedded systems and serves as a reminder of the critical need for thorough security testing in IoT device development processes.