CVE-2026-7426

EUVD-2026-26284
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.1 HIGH
ADJACENT_NETWORK
LOW
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 6%
Affected Products (NVD)
VendorProductVersion
amazonfreertos-plus-tcp
4.0.0 ≤
𝑥
< 4.2.6
amazonfreertos-plus-tcp
4.3.0 ≤
𝑥
< 4.4.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://aws.amazon.com/security/security-bulletins/2026-023-aws/
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3x