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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-7426 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

Nist CVSS score does not match with CNA score
CNA:  AMZN
CVSS-B 6.1 MEDIUM
Vector:  CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://aws.amazon.com/security/security-bulletins/2026-023-aws/ AMZN
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 AMZN
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 AMZN
https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3x AMZN

Weakness Enumeration

CWE-ID CWE Name Source
CWE-787 Out-of-bounds Write AMZN  

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-7426
NVD Published Date:
04/29/2026
NVD Last Modified:
04/30/2026
Source:
AMZN