CVE-2026-76639 Unitree Robotics CVE debrief

Who should care

Organizations using Unitree G1 EDU firmware through version 1.5.2 should prioritize remediation due to the high risk of unauthenticated remote code execution. This involves inventory and assessment of affected firmware versions, implementation of compensating controls to restrict access to TCP port 9991, monitoring for suspicious activity related to DDS control messages and chat_go knowledge upload API, and application of vendor remediation or patches as available. Verification and enforcement of secure storage and rotation of encryption keys are also crucial. Affected operators, platforms, vulnerability-management, and security teams should be informed and involved in the remediation process to ensure comprehensive coverage and minimize potential impact.

Technical summary

The CVE-2026-76639 vulnerability is an unauthenticated remote code execution issue in Unitree G1 EDU firmware through version 1.5.2. It results from the combination of three weaknesses: an unauthenticated WebRTC-to-DDS bridge on TCP port 9991, a static AES-128 key stored with world-readable permissions, and a path traversal flaw in the chat_go knowledge upload API. This allows network-adjacent attackers to execute arbitrary commands as root by publishing DDS control messages to restart the bashrunner service, planting a malicious payload in its script execution directory via path traversal, and triggering execution of that payload as uid 0 through the bashrunner shell subprocess.

Defensive priority

Unitree G1 EDU firmware vulnerability requires immediate attention due to unauthenticated remote code execution risk.

Recommended defensive actions

• Inventory and assess Unitree G1 EDU firmware versions, prioritizing those with known exposure.
• Implement compensating controls to restrict access to TCP port 9991.
• Monitor for suspicious activity related to DDS control messages and chat_go knowledge upload API.
• Apply vendor remediation or patches as available.
• Verify and enforce secure storage and rotation of encryption keys.

Evidence notes

The CVE-2026-76639 vulnerability involves an unauthenticated remote code execution issue in Unitree G1 EDU firmware through version 1.5.2. The vulnerability is caused by the combination of three weaknesses: an unauthenticated WebRTC-to-DDS bridge on TCP port 9991, a static AES-128 key stored with world-readable permissions, and a path traversal flaw in the chat_go knowledge upload API. This allows network-adjacent attackers to execute arbitrary commands as root. Evidence is based on official CVE and NVD records, as well as references from [email protected].

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.