Auth bypass in Unitree Robotics G1 Edu
CVE-2026-76639
Unitree G1 EDU firmware through 1.5.2 contains an unauthenticated remote code execution vulnerability that allows network-adjacent attackers to execute arbitrary commands as root by chaining 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. Attackers can publish DDS control messages to restart the bashrunner service, plant a malicious payload in its script execution directory via path traversal, and trigger execution of that payload as uid 0 through the bashrunner shell subprocess.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: -0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- boschko.ca/g1-ble-rce/ (technical-description, exploit)
- github.com/OlivierLaflamme/UniBLEed (exploit)
- www.vulncheck.com/advisories/unitree-g1-edu-unauthenticated-rce-via-dds-bridge-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-76639?
- CVE-2026-76639 is a high-severity vulnerability in Unitree Robotics G1 Edu, classified under Path Traversal. CVSS score: 8.8/10. Published 2026-08-27.
- How severe is CVE-2026-76639?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-76639 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.