# CVE-2026-7424

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

## Description

Integer underflow in the DHCPv6 sub-option parser in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network actor to corrupt the device's IPv6 address assignment, DNS configuration, and lease times, and to cause a denial of service (permanent IP task freeze requiring hardware reset) by sending a single crafted DHCPv6 packet.








The issue is present whenever DHCPv6 is enabled.








To mitigate this issue, users should upgrade to version V4.2.6 or V4.4.1 or newer.

## Key facts

- **CVE ID:** CVE-2026-7424
- **Published:** 2026-04-29
- **CVSS severity:** HIGH
- **CVSS base score:** 8.1
- **CWE codes:** CWE-191

## Affected products

- `amazon:freertos-plus-tcp`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7424

## Citation

> AI Analytics. CVE-2026-7424. Retrieved 2026-07-19 from https://api.ai-analytics.org/cve/CVE-2026-7424. Derived from NIST NVD. Licensed CC0.

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