CVE-2026-7426
Published:April 29, 2026
Updated:May 18, 2026
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.
Affected Packages
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP.git (GITHUB):
Affected version(s) >=V2.2.2 <V4.2.6Fix Suggestion:
Update to version V4.2.6https://github.com/FreeRTOS/FreeRTOS-Plus-TCP.git (GITHUB):
Affected version(s) =V4.4.0 <V4.4.1Fix Suggestion:
Update to version V4.4.1Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.1
Attack Vector
ADJACENT
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
ADJACENT
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Out-of-bounds Write
EPSS
Base Score:
0.02