Improper Null Termination Affecting zephyrproject-rtos/zephyr package, versions [,4.3.1-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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- published21 Jun 2026
- disclosed9 Jun 2026
- creditmaru1009
Introduced: 9 Jun 2026
CVE-2026-5067 (opens in a new tab)How to fix?
Upgrade zephyrproject-rtos/zephyr to version 4.3.1-rc1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Null Termination in the HTTP server WebSocket upgrade process when handling the Sec-WebSocket-Key header. An attacker can cause memory corruption, leading to out-of-bounds read and write on stack memory, by sending a specially crafted header that lacks a null terminator. This can result in a crash or potentially allow execution of arbitrary code. This is only exploitable if the CONFIG_HTTP_SERVER_WEBSOCKET configuration is enabled.