Unitree Robotics G1 EDU up to 1.5.2 BLE GATT Server system buffer overflow

Summaryinfo

A vulnerability was found in Unitree Robotics G1 EDU up to 1.5.2. It has been rated as very critical. The affected element is the function system of the component BLE GATT Server. The manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-76640. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Unitree Robotics G1 EDU up to 1.5.2 and classified as very critical. This issue affects the function system of the component BLE GATT Server. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Unitree G1 EDU firmware through 1.5.2 contains multiple chained vulnerabilities in the BLE GATT server and WiFi provisioning stack that allow unauthenticated proximate attackers to achieve root code execution without pairing or credentials by exploiting an unquoted heredoc variable in the WiFi provisioning script and a buffer overflow in the SSID chunk accumulator. Attackers can send crafted BLE writes to overflow a fixed BSS buffer across BLE connections, corrupting an adjacent mainloop function pointer dispatch entry that is subsequently invoked by the cleanup path passing attacker-controlled data to system() as uid 0.

It is possible to read the advisory at boschko.ca. The identification of this vulnerability is CVE-2026-76640 since 08/19/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/27/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Unitree Robotics

Name

• G1 EDU

Version

• 1.5.0
• 1.5.1
• 1.5.2

CPE 2.3info

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CPE 2.2info

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