barebox: FIT Signature Verification Bypass Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-33243
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-20 23:16:47 UTC
Updated2026-09-11 15:55:06 UTC
Descriptionbarebox 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.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from [email protected]

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

Problem Types: CWE-345 | CWE-345 CWE-345: Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.2HIGHCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.3HIGHCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Pengutronix Barebox All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Barebox Barebox affected >= 2016.03.0, < 2025.09.3 Not specified
CNA Barebox Barebox affected >= 2025.10.0, < 2026.03.1 Not specified

References

ReferenceSourceLinkTags
github.com/barebox/barebox/commit/aca01795056d51060cb096f9a1ea309361743e05 [email protected] github.com Patch
github.com/barebox/barebox/security/advisories/GHSA-3fvj-q26p-j6h4 [email protected] github.com Patch, Vendor Advisory
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