CVE-2026-50720: Ingenic T31 SoC boot ROM vulnerability
The Ingenic T31 SoC boot ROM flash-boot verification path compares only a single 32-bit word of the RSA signature output against a single 32-bit word of the SHA-256 payload digest, rather than compare the full data. This allows an attacker with physical write access to boot media to forge modified SPL (Secondary Program Loader) images that pass secure boot verification without possession of the OEM signing key. Each forgery attempt succeeds with approximately 2/3 probability. This has been validated via reverse engineering, software emulation against vendor-signed images, and end-to-end hardware acceptance of a forged firmware image on a Wyze Video Doorbell v2 (T31X).
Affected Software
Event History
Frequently Asked Questions
What level of access does an attacker need to exploit this issue?
The attacker needs physical write access to the device's boot media. They can then modify the SPL image and attempt to boot the forged image.
Does an attacker need the OEM signing key, and how reliable is exploitation?
No OEM signing key is required to forge a modified SPL image that passes verification. Each forgery attempt succeeds with approximately 2/3 probability.
Has this been demonstrated on a real product?
Yes. End-to-end hardware acceptance of a forged firmware image was validated on a Wyze Video Doorbell v2 using the T31X.