CVE-2026-7426
8.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| AWS | FreeRTOS-Plus-TCP | 4.0.0 < 4.2.6 | affected |
| AWS | FreeRTOS-Plus-TCP | 4.3.0 < 4.4.1 | affected |
| AWS | FreeRTOS-Plus-TCP | 4.2.6 | unaffected |
| AWS | FreeRTOS-Plus-TCP | 4.4.1 | unaffected |
Weaknesses
- CWE-787: CWE-787: Out-of-bounds Write
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6
- https://aws.amazon.com/security/security-bulletins/2026-023-aws/
- https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3x
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