Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Denx | U-Boot | >= 2013.07, < 2026.04 |
| Pengutronix | Barebox | >= 2016.03.0, < 2025.09.3 |
Related Weaknesses (CWE)
References
- https://github.com/barebox/barebox/commit/aca01795056d51060cb096f9a1ea309361743ePatch
- https://github.com/barebox/barebox/security/advisories/GHSA-3fvj-q26p-j6h4PatchVendor Advisory
FAQ
What is CVE-2026-33243?
CVE-2026-33243 is a vulnerability with a CVSS score of 8.2 (HIGH). 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 vulnerabili...
How severe is CVE-2026-33243?
CVE-2026-33243 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33243?
Check the references section above for vendor advisories and patch information. Affected products include: Denx U-Boot, Pengutronix Barebox.