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High severity8.2NVD Advisory· Published Mar 20, 2026· Updated Jun 17, 2026

CVE-2026-33243

CVE-2026-33243

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

7
  • Denx/U Boot4 versions
    cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:*+ 3 more
    • cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:*range: >=2013.07,<2026.04
    • 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:*:*:*:*:*:*
  • Pengutronix/Barebox
    cpe:2.3:a:pengutronix:barebox:*:*:*:*:*:*:*:*
    Range: >=2016.03.0,<2025.09.3
  • Barebox/Bareboxllm-fuzzy2 versions
    2016.03.0 <= v < 2026.03.1, 2025.09.3+ 1 more
    • (no CPE)range: 2016.03.0 <= v < 2026.03.1, 2025.09.3
    • (no CPE)range: >= 2016.03.0, < 2025.09.3

Patches

Vulnerability mechanics

References

2

News mentions

1