High severity8.1NVD Advisory· Published Apr 29, 2026· Updated May 4, 2026
CVE-2026-7424
CVE-2026-7424
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.
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/2026-022-aws/nvdVendor Advisory
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-wrhm-c99p-2p8gnvdVendor Advisory
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6nvdRelease Notes
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1nvdRelease Notes
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