CVE-2026-7424

EUVD-2026-26277

29.04.2026, 19:16

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

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	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

Awaiting analysis

This vulnerability is currently awaiting analysis.

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Common Weakness Enumeration

CWE-191 - Integer Underflow (Wrap or Wraparound)
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

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