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CVE-2026-7424

Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP

CVSS 7.2 HIGHEPSS 0.2%CWE-191
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.
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
Produtos afetados
AWS · FreeRTOS-Plus-TCP

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Referências
https://aws.amazon.com/security/security-bulletins/2026-022-aws/https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-wrhm-c99p-2p8g