CVE-2026-7426

HIGH

Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in FreeRTOS-Plus-TCP

Title source: cna
STIX 2.1

Description

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.

References (4)

Core 4

Scores

CVSS v3 8.1
EPSS 0.0025
EPSS Percentile 15.6%
Attack Vector ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-787
Status published
Products (5)
amazon/freertos-plus-tcp 4.0.0 - 4.2.6
AWS/FreeRTOS-Plus-TCP 4.0.0 - 4.2.6
AWS/FreeRTOS-Plus-TCP 4.2.6
AWS/FreeRTOS-Plus-TCP 4.3.0 - 4.4.1
AWS/FreeRTOS-Plus-TCP 4.4.1
Published Apr 29, 2026
Tracked Since Apr 30, 2026