Out-of-bounds Write Affecting FreeRTOS/FreeRTOS-Plus-TCP package, versions [,4.2.6)[4.3.0,4.4.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-FREERTOSFREERTOSPLUSTCP-16323059
- published30 Apr 2026
- disclosed29 Apr 2026
- creditUnknown
Introduced: 29 Apr 2026
NewCVE-2026-7426 (opens in a new tab)How to fix?
Upgrade FreeRTOS/FreeRTOS-Plus-TCP to version 4.2.6, 4.4.1 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write in the processing of IPv6 Router Advertisements due to insufficient validation of the prefix length field. An attacker can cause memory corruption and potentially execute arbitrary code or disrupt device operation by sending a crafted Router Advertisement with a prefix length value exceeding the maximum valid length. This is only exploitable if IPv6 Router Advertisement processing is enabled; systems processing only IPv4 Router Advertisements are not impacted.