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Vulnerability record · CVE-2026-34963 · published 11 May 2026

CVE-2026-34963: Pengutronix barebox integer overflow vulnerability

Pengutronix · Barebox

barebox 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 virtual image size computation using 32-bit arithmetic on section VirtualAddress and size values allows undersized heap allocation, and PE section loading logic fails to validate that PointerToRawData plus copied size remains within the PE file buffer. An attacker can supply a malicious EFI PE binary via TFTP, USB, SD card, or network boot to trigger heap buffer overflow or out-of-bounds read from heap memory, potentially achieving code execution in bootloader context.

8.6 CVSS 4.0 High EPSS 0.22% · top 88.6% CWE-190 · Integer overflow
8.6CVSS 4.0 base score
0.22%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
18 Jul 2026Last modified by NVD

Description

barebox 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 virtual image size computation using 32-bit arithmetic on section VirtualAddress and size values allows undersized heap allocation, and PE section loading logic fails to validate that PointerToRawData plus copied size remains within the PE file buffer. An attacker can supply a malicious EFI PE binary via TFTP, USB, SD card, or network boot to trigger heap buffer overflow or out-of-bounds read from heap memory, potentially achieving code execution in bootloader context.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

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

References

LinkTags
https://github.com/barebox/barebox Product
https://github.com/barebox/barebox/releases/tag/v2026.04.0 Release Notes
https://www.vulncheck.com/advisories/barebox-efi-pe-loader-memory-safety-vulnerabilities Third Party Advisory
https://y637f9qq2x.com/posts/barebox-sandbox-vulns/

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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%8.2CVE-2026-33243Pengutronix barebox insufficient verification of data authenticity vulnerabilitybarebox 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 cou…EPSS 0.12%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-2026-34963), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.