CVE-2026-33243

Severity CVSS v4.0:

Pending analysis

Type:

CWE-345 Insufficient Verification of Data Authenticity

Publication date:

20/03/2026

Last modified:

26/03/2026

Description

barebox is a bootloader. In barebox from version 2016.03.0 to before version 2026.03.1 (and the corresponding backport to 2025.09.3), an attacker could exploit a FIT signature verification vulnerability to trick the bootloader into booting different images than those that were verified as part of a signed configuration. mkimage(1) sets the hashed-nodes property of the FIT signature node to list which nodes of the FIT were hashed as part of the signing process as these will need to be verified later on by the bootloader. However, hashed-nodes itself is not part of the hash and could therefore be modified to allow booting different images than those that have been verified. This issue has been patched in barebox versions 2026.03.1 and backported to 2025.09.3.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.20 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

8.20

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:denx:u-boot::::::::	2013.07 (including)	2026.04 (excluding)
cpe:2.3:a:denx:u-boot:2026.04:rc1::::::
cpe:2.3:a:denx:u-boot:2026.04:rc2::::::
cpe:2.3:a:denx:u-boot:2026.04:rc3::::::
cpe:2.3:a:pengutronix:barebox::::::::	2016.03.0 (including)	2025.09.3 (excluding)
cpe:2.3:a:pengutronix:barebox::::::::	2025.10.0 (including)	2026.03.1 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-33243

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools