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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 Reserved 2026-04-29 | Published 2026-04-29 | Updated 2026-04-29 | Assigner AMZN




HIGH: 8.1CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

MEDIUM: 6.1CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-787: Out-of-bounds Write

Product status

Default status
unaffected

4.0.0 (semver) before 4.2.6
affected

4.3.0 (semver) before 4.4.1
affected

4.2.6
unaffected

4.4.1
unaffected

References

github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1 patch

github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6 patch

aws.amazon.com/security/security-bulletins/2026-023-aws/ vendor-advisory

github.com/...us-TCP/security/advisories/GHSA-97qg-4359-xm3x third-party-advisory

cve.org (CVE-2026-7426)

nvd.nist.gov (CVE-2026-7426)

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