MediaTek Android Security Vulnerability CVE 2026 20435 Allows Physical Data Theft
The critical security vulnerability affects all Android devices that use MediaTek chips for their operation. The Donjon security research team which belongs to Ledger discovered a serious security vulnerability in MediaTek based Android smartphones on March 12 2026. The security flaw CVE 2026 20435 enables attackers with physical contact to defeat all security systems and steal secret data within a time period of 45 seconds. The exploit allows execution during both smartphone power off state and Android operating system non boot state.
The research team demonstrated the breach using a CMF Phone 1 by Nothing. The team used a computer link to break through the system's security defenses. The security flaw enables the following actions to be performed
- Credential Theft: Attackers can obtain the device's user PIN.
- Memory Decryption: The exploit enables the decryption of stored data on the device's internal memory.
- Cryptocurrency Risks: Hackers can extract seed phrases used for recovering digital wallets which directly endanger financial assets.
The researchers found that the MediaTek chips create a security hole by their method of handling sensitive data. MediaTek chipsets use the Trusted Execution Environment TEE system which establishes a secure area for their main processor to protect their sensitive data. The TEE security method creates a risk because it makes sensitive data vulnerable to attacks against the main processor's operational logic. This risk occurs because major device manufacturers like Google Pixel and iPhone and Snapdragon high end phones use Secure Element chips which create a secure separation for their sensitive data.
MediaTek has recognized the security vulnerability and developed a security patch for CVE 2026 20435. The update will only become available when each manufacturer decides to implement their patch distribution process. MediaTek security alerts indicate that the main security risk affects entry level and mid range products from major brands which include
- OPPO
- vivo
- OnePlus
- Samsung
The security patch has been created but its actual use in operational attacks remains unknown. Users should immediately download the March 2026 security patch when it becomes available for their device model to protect themselves from potential data theft through physical means.
