# CVE-2026-7426

> Vulnerability · severity: **HIGH** (CVSS 8.1).

## 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.

## Key facts

- **CVE ID:** CVE-2026-7426
- **Published:** 2026-04-29
- **CVSS severity:** HIGH
- **CVSS base score:** 8.1
- **CWE codes:** CWE-787

## Affected products

- `amazon:freertos-plus-tcp`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7426

## Citation

> AI Analytics. CVE-2026-7426. Retrieved 2026-07-19 from https://api.ai-analytics.org/cve/CVE-2026-7426. Derived from NIST NVD. Licensed CC0.

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