CVE-2026-33243 (GCVE-0-2026-33243)
Vulnerability from cvelistv5 – Published: 2026-03-20 22:51 – Updated: 2026-03-26 20:08
VLAI
EPSS
VEX
Title
barebox: FIT Signature Verification Bypass Vulnerability
Summary
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.
Severity
8.3 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-24 15:31 UTC
CWE
- CWE-345 - Insufficient Verification of Data Authenticity
Assigner
GitHub_M
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/barebox/barebox/security/advis… | x_refsource_CONFIRM |
| https://github.com/barebox/barebox/commit/aca0179… | x_refsource_MISC |
Impacted products
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| Author | Source | Type | Date | Other |
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Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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