---
id: CVE-2025-70290
title: An issue was discovered in Denx U-Boot before 2026.04
summary: >-
  An issue was discovered in Denx U-Boot before 2026.04. An integer overflow
  vulnerability in the ZFS filesystem support can be triggered by malformed
  on-disk metadata. The issue may result in incorrect memory allocation followed
  by out-of…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
  - CWE-787
published: '2026-08-26'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:04:24.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-70290'
references:
  - url: 'http://u-boot.com'
    label: cve@mitre.org
  - url: 'https://gist.github.com/c0zy1/4d9648d10a5ff07bda2771ea1298e469'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.00673
epssPercentile: 0.49974
ingestedAt: '2026-09-09T16:14:05.516Z'
---

## Overview

An issue was discovered in Denx U-Boot before 2026.04. An integer overflow vulnerability in the ZFS filesystem support can be triggered by malformed on-disk metadata. The issue may result in incorrect memory allocation followed by out-of-bounds memory access, potentially leading to a crash or arbitrary code execution during the boot process.

## Remediation

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