CVE-2026-7426HIGH 8.1EPSS p15.6%

CVE-2026-7426CVE-2026-7426

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.

Scoring

CVSS 3.18.1 (HIGH)
VectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
EPSS0.25% probability of exploitation · percentile 15.6% · 2026-06-19T12:03:05Z
Published2026-04-29
Last modified2026-05-04

Underlying weaknesses· 1

CWE-787

References

  1. https://aws.amazon.com/security/security-bulletins/2026-023-aws/
  2. https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
  3. https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
  4. https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3x

1

TypeTargetConfidenceTier
WeaknessOut-of-bounds Writecwe-7870%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.