CVE-2026-34963: high-severity vulnerability in barebox
barebox EFI PE Loader Memory Safety Vulnerabilities
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.6epss 0.2%
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
Affected products
barebox · bareboxRelated CVEs — barebox
In the same product, most dangerous first.
CVE-2026-34960HIGHbarebox Out-of-Bounds Read in DHCP Option ParsingEPSS 0.3%CVE-2026-34961MEDIUMbarebox ext4 Extent Parsing Out-of-Bounds ReadEPSS 0.2%CVE-2026-34962MEDIUMbarebox ext4 Directory Parsing Infinite Loop Denial of ServiceEPSS 0.1%CVE-2026-33243HIGHbarebox: FIT Signature Verification Bypass VulnerabilityEPSS 0.1%