CVE-2026-7426

MEDIUM EPSS 15.7%
Published Apr 29, 20262mo ago · Modified Jun 17, 20262w ago
6.1 CVSS 4.0
Medium
Find Similar
Published Apr 29, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
6.1
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Adjacent
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
15.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 2

VendorProductVersionRange
amazonfreertos-plus-tcp*≥4.0.0  –  <4.2.6
amazonfreertos-plus-tcp*≥4.3.0  –  <4.4.1

References 4

  • aws.amazon.com https://aws.amazon.com/security/security-bulletins/2026-023-aws/
    Vendor Advisory
  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
    Release Notes
  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
    Release Notes
  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3x
    PatchVendor Advisory

Remediation

  • github.com https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3x
    PatchVendor Advisory