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CVE-2026-34960— barebox Out-of-Bounds Read in DHCP Option Parsing

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之前版本存在缓冲区错误漏洞，该漏洞源于DHCP选项解析中dhcp_message_type()函数未验证选项指针是否在接收数据包边界内，可能导致攻击者发送特制DHCP Offer或ACK数据包导致越界读取并可能使系统崩溃。

CVSS 6.5 · Medium EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
barebox barebox < 2026.04.0 affected
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I. Basic Information for CVE-2026-34960

Vulnerability Information
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Vulnerability Title
barebox Out-of-Bounds Read in DHCP Option Parsing
Source: CVE Program / CVE List V5
Vulnerability Description
barebox prior to version 2026.04.0 contains an out-of-bounds read vulnerability in DHCP option parsing within the dhcp_message_type() function that fails to verify the options pointer remains within received packet bounds. An attacker on the same broadcast domain can send a crafted DHCP Offer or ACK packet without a proper 0xff end marker to cause the parser to read past valid packet data and potentially crash the system.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Barebox 缓冲区错误漏洞
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之前版本存在缓冲区错误漏洞，该漏洞源于DHCP选项解析中dhcp_message_type()函数未验证选项指针是否在接收数据包边界内，可能导致攻击者发送特制DHCP Offer或ACK数据包导致越界读取并可能使系统崩溃。
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-2026-34960

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III. Intelligence Information for CVE-2026-34960

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Vendor Advisories for CVE-2026-34960 (1)

Vendor Pages for CVE-2026-34960 (1)

Other References for CVE-2026-34960 (1)

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

CVE-2026-34963 8.4 HIGH barebox EFI PE Loader Memory Safety Vulnerabilities
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-125

V. Comments for CVE-2026-34960

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