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CVE-2026-34963— barebox EFI PE Loader Memory Safety Vulnerabilities

Quick assessment

Affected
barebox barebox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Barebox是Barebox开源的一个多功能且灵活的引导加载程序。 barebox 2026.04.0之前版本存在输入验证错误漏洞，该漏洞源于EFI PE加载器中整数溢出和未验证边界，可能导致攻击者提供恶意EFI PE二进制文件触发堆缓冲区溢出或越界读取并可能在引导加载程序环境中执行代码。

CVSS 8.4 · High EPSS 0.22% · P12

Affected Version Matrix 1

VendorProduct Version RangeStatus
barebox barebox < 2026.04.0 affected
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I. Basic Information for CVE-2026-34963

Vulnerability Information
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Vulnerability Title
barebox EFI PE Loader Memory Safety Vulnerabilities
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
Barebox 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Barebox是Barebox开源的一个多功能且灵活的引导加载程序。 barebox 2026.04.0之前版本存在输入验证错误漏洞，该漏洞源于EFI PE加载器中整数溢出和未验证边界，可能导致攻击者提供恶意EFI PE二进制文件触发堆缓冲区溢出或越界读取并可能在引导加载程序环境中执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
barebox barebox 0 ~ 2026.04.0 -

II. Public POCs for CVE-2026-34963

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III. Intelligence Information for CVE-2026-34963

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Vendor Advisories for CVE-2026-34963 (1)

Vendor Pages for CVE-2026-34963 (1)

Other References for CVE-2026-34963 (1)

Same Patch Batch · barebox · 2026-05-11 · 4 CVEs total

CVE-2026-34960 6.5 MEDIUM barebox Out-of-Bounds Read in DHCP Option Parsing
CVE-2026-34962 6.2 MEDIUM barebox ext4 Directory Parsing Infinite Loop Denial of Service
CVE-2026-34961 6.2 MEDIUM barebox ext4 Extent Parsing Out-of-Bounds Read

IV. Related Vulnerabilities

Same product: barebox
Same vendor: barebox
Same weakness: CWE-190

V. Comments for CVE-2026-34963

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