Medium severity6.5NVD Advisory· Published Apr 29, 2026· Updated May 4, 2026
CVE-2026-7422
CVE-2026-7422
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.
Affected products
2- cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*Range: >=4.0.0,<4.2.6
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- aws.amazon.com/security/security-bulletins/2026-021-aws/nvdVendor Advisory
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-jpw4-6h59-62w9nvdVendor AdvisoryPatch
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6nvdRelease Notes
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1nvdRelease Notes
News mentions
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