Vulnerability record/PUBLISHED/Published Nov 11, 2026 10:41:14 UTC

CVE-2026-124741

A flaw was found in BusyBox. The udhcpc6 DHCPv6 client does not properly validate the size of network options sent by a server before copying them into memory. A malicious DHCPv6 server on the local network can exploit this flaw by sending a crafted reply, triggering a stack-based buffer overflow. This vulnerability could allow an attacker to achieve arbitrary code execution with root privileges or cause a denial of service (DoS) crash.

Base score7.6/ 10

SeverityHighCVSS 3.1

Exploitability / impact

CVSS metric breakdown

Vector-derived attributes

Base severityHigh

Attack vectorAdjacentAV

Attack complexityLowAC

Privileges requiredNonePR

User interactionNoneUI

ScopeUnchangedS

Confidentiality impactLowC

Integrity impactLowI

Availability impactHighA

CVSS vector stringCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

CVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.

Record context

CVE Numbering Authorityredhat

Last updatedNov 12, 2026 16:02:07 UTC

PublishedNov 11, 2026 10:41:14 UTC

ReservedNov 9, 2026 11:36:29 UTC

Credits

Red Hat would like to thank ducanhluu for reporting this issue.