Is CVE-2026-74222 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-74222 being exploited in the wild.

How severe is CVE-2026-74222?

High severity, with a CVSS score of 8.2, published 29 September 2026.

Is there a fix for CVE-2026-74222?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-74222 attacked?

It is attacked over the network, in device firmware.

Am I affected by CVE-2026-74222?

Check whether you run U-Boot at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-74222: U-Boot use-after-free in lwIP wget HTTP callback

CVE-2026-74222 · Severity: high · CVSS 8.2 · Published 2026-09-29

U-Boot is a bootloader that initializes hardware and loads the operating system on embedded devices and systems. A use-after-free vulnerability in its HTTP download feature can crash the bootloader when downloading fails, potentially preventing devices from booting and creating a denial-of-service condition. An attacker with network access could trigger this by serving a malicious HTTP response, rendering affected devices inoperable until repaired or recovered.

Technologies: U-Boot. Vendors: U-Boot.

Quick answers

Is CVE-2026-74222 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-74222 being exploited in the wild.
How severe is CVE-2026-74222?: High severity, with a CVSS score of 8.2, published 29 September 2026.
Which products and versions are affected?: U-Boot before 2026.10-rc5.
Is there a fix for CVE-2026-74222?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-74222 attacked?: It is attacked over the network, in device firmware.
Am I affected by CVE-2026-74222?: Check whether you run U-Boot at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The httpc_recv_cb() callback function in the lwIP wget implementation frees a TCP protocol control block (PCB) but returns ERR_BUF instead of ERR_ABRT when HTTP data storage fails. This incorrect return code causes the TCP input path to continue processing the released PCB, leading to a use-after-free crash in the bootloader. The vulnerability affects U-Boot versions before 2026.10-rc5 and requires network access to trigger via a failed HTTP transfer.

Affected products

U-Boot U-Boot before 2026.10-rc5

Timeline

2026-09-29: disclosed

References

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