barebox up to 2025.09.2/2026.03.0 data authenticity

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability was found in barebox up to 2025.09.2/2026.03.0. It has been rated as critical. The affected element is an unknown function. This manipulation causes data authenticity. This vulnerability appears as CVE-2026-33243. The attack requires local access. There is no available exploit. Upgrading the affected component is advised. This entry has a duplicate CVE-2026-46728 assigned.

Detailsinfo

A vulnerability was found in barebox up to 2025.09.2/2026.03.0. It has been declared as critical. Affected by this vulnerability is an unknown function. The manipulation with an unknown input leads to a data authenticity vulnerability. The CWE definition for the vulnerability is CWE-345. The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-33243 since 03/18/2026. The exploitation appears to be easy. Attacking locally is a requirement. Additional levels of successful authentication are necessary for exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 326582 (EulerOS 2.0 SP10 : uboot-tools (EulerOS-SA-2026-2716)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2025.09.3 or 2026.03.1 eliminates this vulnerability. Applying the patch aca01795056d51060cb096f9a1ea309361743e05 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (326582). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.3

VulDB Base Score: 6.7
VulDB Temp Score: 6.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.2
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Data authenticity
CWE: CWE-345
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 326582
Nessus Name: EulerOS 2.0 SP10 : uboot-tools (EulerOS-SA-2026-2716)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: barebox 2025.09.3/2026.03.1
Patch: aca01795056d51060cb096f9a1ea309361743e05

Timelineinfo

03/18/2026 CVE reserved
03/21/2026 +3 days Advisory disclosed
03/21/2026 +0 days VulDB entry created
07/14/2026 +115 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-3fvj-q26p-j6h4
Status: Confirmed

CVE: CVE-2026-33243 (🔒)
CVE Duplicate: 🔍
GCVE (CVE): GCVE-0-2026-33243
GCVE (VulDB): GCVE-100-352303

Entryinfo

Created: 03/21/2026 08:13
Updated: 07/14/2026 13:07
Changes: 03/21/2026 08:13 (64), 03/27/2026 06:05 (2), 05/17/2026 03:34 (1), 07/14/2026 13:07 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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