barebox up to 2026.04.0 DHCP dhcp_message_type out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in barebox up to 2026.04.0. This affects the function dhcp_message_type of the component DHCP Handler. The manipulation leads to out-of-bounds. This vulnerability is traded as CVE-2026-34960. Access to the local network is required for this attack to succeed. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in barebox up to 2026.04.0. This issue affects the function dhcp_message_type of the component DHCP Handler. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is availability. The summary by CVE is:

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.

The weakness was shared by Kazuma Matsumoto. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-34960 since 03/31/2026. The exploitation is known to be easy. The attack can only be done within the local network. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available.

Upgrading to version 2026.04.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: barebox 2026.04.0

Timelineinfo

03/31/2026 CVE reserved
05/12/2026 +42 days Advisory disclosed
05/12/2026 +0 days VulDB entry created
05/12/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Researcher: Kazuma Matsumoto
Status: Confirmed

CVE: CVE-2026-34960 (🔒)
GCVE (CVE): GCVE-0-2026-34960
GCVE (VulDB): GCVE-100-362909

Entryinfo

Created: 05/12/2026 04:38
Changes: 05/12/2026 04:38 (78)
Complete: 🔍
Cache ID: 216::103

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