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CVE-2026-7426— Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in FreeRTOS-Plus-TCP

Quick assessment

Affected
AWS FreeRTOS-Plus-TCP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeRTOS-Plus-TCP是FreeRTOS开源的一种适用于 FreeRTOS 的可扩展的开源和线程安全 TCP/IP 堆栈。 FreeRTOS-Plus-TCP V4.2.6之前版本和V4.4.1之前版本存在缓冲区错误漏洞，该漏洞源于IPv6路由器通告处理中前缀长度字段验证不足，可能导致相邻网络参与者造成内存损坏。

CVSS 8.1 · High EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
AWS FreeRTOS-Plus-TCP 4.0.0< 4.2.6 affected
4.3.0< 4.4.1 affected
4.2.6 unaffected
4.4.1 unaffected
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I. Basic Information for CVE-2026-7426

Vulnerability Information
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Vulnerability Title
Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in FreeRTOS-Plus-TCP
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRTOS-Plus-TCP 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRTOS-Plus-TCP是FreeRTOS开源的一种适用于 FreeRTOS 的可扩展的开源和线程安全 TCP/IP 堆栈。 FreeRTOS-Plus-TCP V4.2.6之前版本和V4.4.1之前版本存在缓冲区错误漏洞，该漏洞源于IPv6路由器通告处理中前缀长度字段验证不足，可能导致相邻网络参与者造成内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AWS FreeRTOS-Plus-TCP 4.0.0 ~ 4.2.6 -

II. Public POCs for CVE-2026-7426

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III. Intelligence Information for CVE-2026-7426

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Vendor Advisories for CVE-2026-7426 (2)

Vendor Pages for CVE-2026-7426 (2)

Same Patch Batch · AWS · 2026-04-29 · 5 CVEs total

CVE-2026-7424 8.1 HIGH Integer Underflow in DHCPv6 Sub-Option Parser in FreeRTOS-Plus-TCP
CVE-2026-7422 6.5 MEDIUM MAC Address Validation Bypass in FreeRTOS-Plus-TCP IPv4 and IPv6 Packet Processing
CVE-2026-7425 6.5 MEDIUM Out-of-Bounds Read in Router Advertisement Option Parser in FreeRTOS-Plus-TCP
CVE-2026-7423 5.3 MEDIUM Integer Underflow in ICMP Echo Reply Processing in FreeRTOS-Plus-TCP

IV. Related Vulnerabilities

Same product: FreeRTOS-Plus-TCP
Same vendor: AWS
Same weakness: CWE-787

V. Comments for CVE-2026-7426

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