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.
Published: 2026-04-29
Score: 6.1 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Mon, 04 May 2026 13:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:amazon:freertos-plus-tcp:*:*:*:*:*:*:*:*

Thu, 30 Apr 2026 08:30:00 +0000

Type Values Removed Values Added
First Time appeared Amazon
Amazon freertos-plus-tcp
Vendors & Products Amazon
Amazon freertos-plus-tcp

Wed, 29 Apr 2026 22:45:00 +0000


Wed, 29 Apr 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 29 Apr 2026 19:30:00 +0000

Type Values Removed Values Added
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.
Title Out-of-Bounds Write via Unsanitized Prefix Length in Router Advertisement Processing in FreeRTOS-Plus-TCP
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'}

cvssV4_0

{'score': 6.1, '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'}


Subscriptions

Amazon Freertos-plus-tcp
cve-icon MITRE

Status: PUBLISHED

Assigner: AMZN

Published:

Updated: 2026-04-29T22:14:34.199Z

Reserved: 2026-04-29T14:27:53.201Z

Link: CVE-2026-7426

cve-icon Vulnrichment

Updated: 2026-04-29T19:33:08.227Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-29T20:16:32.143

Modified: 2026-05-04T13:12:17.510

Link: CVE-2026-7426

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-30T08:15:31Z

Weaknesses