CVE-2026-34963— barebox EFI PE Loader Memory Safety Vulnerabilities
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
整数溢出或超界折返
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-34963
| # | POC Description | Source Link | Shenlong Link |
|---|
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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 weakness: CWE-190
- CVE-2021-26380
Trusted OS驱动内存越界致完整性丢失 - CVE-2026-44673
libyang: lyb_read_string() integer overflow → heap buffer ov - CVE-2026-44637
libsixel: integer overflow in parser - CVE-2026-43905
OpenImageIO: JPEG2000 (OpenJPH) signed integer overflow in b - CVE-2026-43907
OpenImageIO: Integer overflow in QueryRGBBufferSizeInternal
V. Comments for CVE-2026-34963
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