Always-Incorrect Control Flow Implementation Affecting zephyrproject-rtos/zephyr package, versions [,4.4.1-rc1)
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-ZEPHYRPROJECTRTOSZEPHYR-17705232
- published30 Jun 2026
- disclosed29 Jun 2026
- creditUnknown
Introduced: 29 Jun 2026
CVE-2026-7656 (opens in a new tab)How to fix?
Upgrade zephyrproject-rtos/zephyr to version 4.4.1-rc1 or higher.
Overview
Affected versions of this package are vulnerable to Always-Incorrect Control Flow Implementation due to improper input validation in the handle_ra_input, handle_ns_input, and handle_na_input functions. An attacker can inject forged Router Advertisement, Neighbor Solicitation, or Neighbor Advertisement messages by sending specially crafted IPv6 Neighbor Discovery packets, potentially reconfiguring network parameters, poisoning neighbor caches, enabling man-in-the-middle attacks, redirecting traffic, or causing denial of service.