High severity8.1NVD Advisory· Published Apr 29, 2026· Updated May 4, 2026
CVE-2026-7426
CVE-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.
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Affected products
3(expand)+ 1 more
- (no CPE)
- (no CPE)range: before V4.2.6 and before V4.4.1
Patches
Vulnerability mechanics
References
4- aws.amazon.com/security/security-bulletins/2026-023-aws/nvdVendor Advisory
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/security/advisories/GHSA-97qg-4359-xm3xnvdVendor AdvisoryPatch
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.2.6nvdRelease Notes
- github.com/FreeRTOS/FreeRTOS-Plus-TCP/releases/tag/V4.4.1nvdRelease Notes
News mentions
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