---
id: CVE-2026-50720
title: >-
  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
summary: >-
  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
  attack…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-347
published: '2026-08-19'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:04:24.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-50720'
references:
  - url: 'https://opensensor.io/security/ingenic-t31-bootrom-partial-verification'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-24T19:59:03.546301Z'
ingestedAt: '2026-09-10T19:07:10.865Z'
epss: 0.00094
epssPercentile: 0.00695
---

## Overview

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).

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.