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Vulnerability record · CVE-2026-33243 · published 20 March 2026

CVE-2026-33243: Pengutronix barebox insufficient verification of data authenticity vulnerability

Pengutronix · Barebox

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.

8.2 CVSS 3.1 High EPSS 0.12% · top 98.5% CWE-345 · Insufficient verification of data authenticity
8.2CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
11 Sep 2026Last modified by NVD

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:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/barebox/barebox/commit/aca01795056d51060cb096f9a1ea309361743e05 Patch
https://github.com/barebox/barebox/security/advisories/GHSA-3fvj-q26p-j6h4 PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-15937Pengutronix barebox out-of-bounds write vulnerabilityPengutronix barebox through 2019.08.1 has a remote buffer overflow in nfs_readlink_reply in net/nfs.c because a length field is directly used for a m…EPSS 2.1%9.8CVE-2019-15938Pengutronix barebox out-of-bounds write vulnerabilityPengutronix barebox through 2019.08.1 has a remote buffer overflow in nfs_readlink_req in fs/nfs.c because a length field is directly used for a memc…EPSS 2.1%9.1CVE-2020-13910Pengutronix barebox out-of-bounds read vulnerabilityPengutronix Barebox through v2020.05.0 has an out-of-bounds read in nfs_read_reply in net/nfs.c because a field of an incoming network packet is dire…EPSS 1.2%8.6CVE-2026-34963Pengutronix barebox integer overflow vulnerabilitybarebox version prior to 2026.04.0 contains multiple memory-safety vulnerabilities in the EFI PE loader in efi/loader/pe.c where integer overflow in …EPSS 0.22%7.5CVE-2021-37847Pengutronix barebox vulnerabilitycrypto/digest.c in Pengutronix barebox through 2021.07.0 leaks timing information because memcmp is used during digest verification.EPSS 1.5%7.5CVE-2021-37848Pengutronix barebox observable discrepancy vulnerabilitycommon/password.c in Pengutronix barebox through 2021.07.0 leaks timing information because strncmp is used during hash comparison.EPSS 1.5%7.1CVE-2026-34960Pengutronix barebox out-of-bounds read vulnerabilitybarebox prior to version 2026.04.0 contains an out-of-bounds read vulnerability in DHCP option parsing within the dhcp_message_type() function that f…EPSS 0.38%6.9CVE-2026-34962Pengutronix barebox vulnerabilitybarebox version prior to 2026.04.0 contains a denial-of-service vulnerability in ext4 directory parsing in fs/ext4/ext4_common.c where the ext4fs_ite…EPSS 0.18%

Source: NIST National Vulnerability Database (record CVE-2026-33243), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.