CVE-2026-74222

HIGH 8.2

U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback

CVSS Score

8.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-416
Vendor	u-boot
Product	u-boot
Published	Sep 29, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Affected Versions

u-boot / u-boot

0 < 2026.10-rc5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/u-boot/u-boot/commit/2d94618a58aeb7630f18eee33419ce48d0fd3616 github.com: https://github.com/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c#L194 github.com: https://github.com/u-boot/u-boot vulncheck.com: https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-use-after-free-in-lwip-wget-receive-callback

Credits

Shahriyar Jalayeri (ByteRay Ltd.) Mehrun P. Hunter (ByteRay Ltd.)