CVE-2026-7426

High

Published: 29/04/2026(UTC)Translated: 15/06/2026(UTC)NVD NIST

Summary

In FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1, there is insufficient validation of the prefix length field in IPv6 Router Advertisement processing. This allows an adjacent network actor to cause memory corruption by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length, resulting in a heap buffer overflow.

Risk Assessment

Organizations may be exposed to memory corruption, potentially leading to system crashes or unauthorized data access. Users processing only IPv4 RAs are not affected.

Recommendation

It is recommended to upgrade to the fixed version when available to mitigate the risks associated with this vulnerability.

Other vulnerabilities in FreeRTOS-Plus-TCP

CVE-2026-7424High
An 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.

Original NVD description (English source)

Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause memory corruption by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length, resulting in a heap buffer overflow. Users processing IPv4 RA only are not impacted. To mitigate this issue, users should upgrade to the fixed version when available.