CVE-2026-7426

medium

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

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

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

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

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

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

Details

Source: Mitre, NVD

Published: 2026-04-29

Updated: 2026-04-30

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:A/AC:L/Au:N/C:N/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.1

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Severity: High

CVSS v4

Base Score: 6.1

Vector: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00015