Cyber Posture

CVE-2026-34963

HighPublic PoC

Published: 11 May 2026

Published
11 May 2026
Modified
11 May 2026
KEV Added
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Patch
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CVSS Score 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0001 2.2th percentile
Risk Priority 17 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-34963 is a high-severity Integer Overflow or Wraparound (CWE-190) vulnerability. Its CVSS base score is 8.4 (High).

Operationally, ranked at the 2.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

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…

more

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.

Deeper analysisAI

Automated synthesis unavailable for this CVE.

Details

CWE(s)
CWE-190

References