# CVE-2026-7423

> Vulnerability · severity: **MEDIUM** (CVSS 5.3).

## Description

Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent network user to cause a denial of service (device crash) when outgoing ping support is enabled, because header sizes are subtracted from a packet length field without validating the field is large enough, resulting in a heap out-of-bounds read of up to approximately 65KB.



To mitigate this issue, users should upgrade to the fixed version when available.

## Key facts

- **CVE ID:** CVE-2026-7423
- **Published:** 2026-04-29
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.3
- **CWE codes:** CWE-191

## Affected products

- `amazon:freertos-plus-tcp`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7423

## Citation

> AI Analytics. CVE-2026-7423. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-7423. Derived from NIST NVD. Licensed CC0.

---

*[Dataset catalog](https://api.ai-analytics.org/datasets/) · [AI Analytics](https://api.ai-analytics.org/) · CC0 1.0*