---
title: "CVE-2026-74222: U-Boot - Use After Free"
description: "U-Boot < 2026.10-rc5 contains a use-after-free vulnerability caused by improper error handling in httpc_recv_cb() function in lwIP wget implementation, letting attackers cause bootloader crash, exploit requires triggering HTTP data storage failure."
url: https://panop.io/threat-heartbeat/CVE-2026-74222/
---

# CVE-2026-74222 U-Boot - Use After Free

U-Boot < 2026.10-rc5 contains a use-after-free vulnerability caused by improper error handling in httpc\_recv\_cb() function in lwIP wget implementation, letting attackers cause bootloader crash, exploit requires triggering HTTP data storage failure.

CVSS base score 8.2 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.30% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-74222)

## Details

Type

Use After Free

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Published

29 September 2026

Updated

15 October 2026

Weakness

[CWE-416](https://cwe.mitre.org/data/definitions/416.html)

## Vendor fix

Update to version 2026.10-rc5 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-74222](https://nvd.nist.gov/vuln/detail/CVE-2026-74222)
- [https://github.com/u-boot/u-boot](https://github.com/u-boot/u-boot)
- [https://github.com/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c#L194](https://github.com/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c#L194)
- [https://github.com/u-boot/u-boot/commit/2d94618a58aeb7630f18eee33419ce48d0fd3616](https://github.com/u-boot/u-boot/commit/2d94618a58aeb7630f18eee33419ce48d0fd3616)
- [https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-use-after-free-in-lwip-wget-receive-callback](https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-use-after-free-in-lwip-wget-receive-callback)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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