Dashboard / CVE-2026-34963

CVE-2026-34963

HIGH
MEDIUM Priority: 0.01 BB Relevance: 52/100
Published: 2026-05-11 Modified: 2026-11-11 First seen: 2026-11-08 Status: active

Attack Surface

Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Local
AC: Low
PR: None
UI: None
S: X
AT: None
VC: High
VI: High
VA: High

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
barebox barebox 0 < 2026.04.0
pengutronix barebox < 2026.04.0

References & Advisories (4)

Bug Bounty Relevance

52 / 100
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

8.6 / 10.0 v4.0
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:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.15%
Raw Score 0.001550
Percentile 4.8%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00155
2026-11-12
0.00155
2026-11-10
0.00155
2026-11-09
0.00155
2026-11-08
0.00155

Intelligence Sources

mitre ref →
nvd ref →

External Links