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CVE-2026-7426

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CVE-2026-7426

Published: Apr 29, 2026

Modified: Apr 29, 2026

PUBLISHED

CVSS v3.1

8.1

HIGH

Description

Insufficient validation of the prefix length field in IPv6 Router Advertisement processing in FreeRTOS-Plus-TCP before V4.2.6 and V4.4.1 allows an adjacent network actor to cause memory corruption by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length, resulting in a heap buffer overflow. Users processing IPv4 RA only are not impacted. To mitigate this issue, users should upgrade to the fixed version when available.

VendorProductVersions

AWS

FreeRTOS-Plus-TCP

affected
4.0.0 - < 4.2.6
affected
4.3.0 - < 4.4.1
unaffected
4.2.6
unaffected
4.4.1

Weaknesses (CWE)

CWE-787

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

High

References

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