Vulnerability in Barebox
CVE-2026-33243
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.
EPSS: 0.001 (1.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Barebox — versions >= 2016.03.0, < 2025.09.3, >= 2025.10.0, < 2026.03.1
- Denx U-boot — versions 2026.04
- Pengutronix Barebox
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-33243?
- CVE-2026-33243 is a high-severity vulnerability in Barebox, classified under Insufficient Verification of Data Authenticity. CVSS score: 8.2/10. Published 2026-03-20.
- How severe is CVE-2026-33243?
- High severity. CVSS v3 base score is 8.2 out of 10.