CVE-2026-7424

EUVD-2026-26277
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.
Wrap or Wraparound
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.1 HIGH
ADJACENT_NETWORK
LOW
NONE
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 3%
Affected Products (NVD)
VendorProductVersion
amazonfreertos-plus-tcp
4.0.0 ≤
𝑥
< 4.2.6
amazonfreertos-plus-tcp
4.3.0 ≤
𝑥
< 4.4.1
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://aws.amazon.com/security/security-bulletins/2026-022-aws/
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-wrhm-c99p-2p8g