---
id: CVE-2026-74222
title: >-
  U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the
  httpc_recv_cb() function within the lwIP wget implementation
summary: >-
  U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the
  httpc_recv_cb() function within the lwIP wget implementation. When HTTP data
  storage fails, the callback frees the connection PCB but returns ERR_BUF
  instead of ERR…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H'
cwe:
  - CWE-416
vendor: u-boot
product: u-boot
affected:
  - u-boot < 2026.10-rc5
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T22:18:33.660'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74222'
references:
  - url: 'https://github.com/u-boot/u-boot'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c#L194'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/u-boot/u-boot/commit/2d94618a58aeb7630f18eee33419ce48d0fd3616
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-use-after-free-in-lwip-wget-receive-callback
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-29T21:49:08.267Z'
---

## Overview

U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the httpc_recv_cb() function within the lwIP wget implementation. When HTTP data storage fails, the callback frees the connection PCB but returns ERR_BUF instead of ERR_ABRT, causing the TCP input path to access released memory and crash the bootloader.

## Remediation

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