6.5
Medium
CVE-2026-7422 Insufficient packet validation in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to…
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 and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| FreeRTOS-Plus-TCP 4.4 | earliest → < 4.4.1 | 4.4.1 |
| FreeRTOS-Plus-TCP 4.3 | 4.3.0 → < 4.4.1 | 4.4.1 |
| FreeRTOS-Plus-TCP 4.2 | earliest → < 4.2.6 | 4.2.6 |
| FreeRTOS-Plus-TCP 4.0 | 4.0.0 → < 4.2.6 | 4.2.6 |
Other CVEs of FreeRTOS-Plus-TCP
The 7 CVEs of FreeRTOS-Plus-TCP →
CVE-2026-7426
Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before…
8.1
High
CVE-2026-7425
Insufficient option length validation in the IPv6 Router Advertisement parser in FreeRTOS-Plus-TCP before V4.2.6 and…
6.5
Medium
CVE-2026-7424
Integer underflow in the DHCPv6 sub-option parser in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an adjacent…
8.1
High
CVE-2026-7423
Integer underflow in the ICMP and ICMPv6 echo reply handlers in FreeRTOS-Plus-TCP before V4.4.1 and V4.2.6 allows an…
5.3
Medium