CVE-2026-7426
Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in FreeRTOS-Plus-TCP
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | aws |
| Product | freertos-plus-tcp |
| Published | Apr 29, 2026 |
| Last Updated | Apr 29, 2026 |
Stay Ahead of the Next One
Get instant alerts for aws freertos-plus-tcp
Be the first to know when new high vulnerabilities affecting aws freertos-plus-tcp are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
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
Affected Versions
AWS / FreeRTOS-Plus-TCP
4.0.0 < 4.2.6 4.3.0 < 4.4.1