Vulnerability Description
Insufficient packet validation in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to bypass all checksum and minimum-size validation by spoofing the Ethernet source MAC address to match one of the device's own registered endpoints, because the loopback detection mechanism skips all input validation for packets whose source MAC matches a local endpoint. To mitigate this issue, users should upgrade to the fixed version when available.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Amazon | Freertos-Plus-Tcp | >= 4.0.0, < 4.2.6 |
Related Weaknesses (CWE)
References
- https://aws.amazon.com/security/security-bulletins/2026-021-aws/Vendor Advisory
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6Release Notes
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1Release Notes
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59Vendor AdvisoryPatch
FAQ
What is CVE-2026-7422?
CVE-2026-7422 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Insufficient packet validation in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to bypass all checksum and minimum-size validation by spoofing the Ethernet source MAC add...
How severe is CVE-2026-7422?
CVE-2026-7422 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-7422?
Check the references section above for vendor advisories and patch information. Affected products include: Amazon Freertos-Plus-Tcp.