CVE-2026-7424 HIGH

CVE-2026-7424: Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP

Vendor Aws
Product FreeRTOS-Plus-TCP
Weakness CWE-191
Published April 29, 2026
Last update April 29, 2026
View on NVD All CVEs

CVSS base score

8.1/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity High

CVSS vector

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

What the vulnerability does

01Description

Integer underflow in the DHCPv6 sub-option parser in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network actor to corrupt the device's IPv6 address assignment, DNS configuration, and lease times, and to cause a denial of service (permanent IP task freeze requiring hardware reset) by sending a single crafted DHCPv6 packet. The issue is present whenever DHCPv6 is enabled. To mitigate this issue, users should upgrade to version V4.2.6 or V4.4.1 or newer.

Key dates

02Disclosure timeline

April 29, 2026 CVE published
April 29, 2026 Record updated