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HIGHCVE-2026-7424Published Modified CNA AMZN

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

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.

Metrics

CVSS v4.0
7.2
Severity
HIGH
Fixed in
4.2.6
Affected Products
1

Fix available

4.2.64.4.1
Affected packages
  • AWS / FreeRTOS-Plus-TCP
    < 4.2.6 (from 4.0.0) · < 4.4.1 (from 4.3.0)
    Fixed in 4.2.6, 4.4.1
CVSS Vector
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
CVE-2026-7424: Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP | HarborGuard CVE