CVE-2026-7426

HIGH8.1

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

Published Apr 29, 2026

Modified 1 weeks ago

Details

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

ADVISORY

https://aws.amazon.com/security/security-bulletins/2026-023-aws/

FIX

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6

FIX

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1

ADVISORY

https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3x

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-7426