CVE-2026-5067
A flaw in the Zephyr HTTP server allows an attacker to cause memory corruption when processing specific WebSocket upgrade requests. This occurs because the system fails to properly terminate a header string, leading to errors when reading and writing memory.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
Users of the Zephyr project software where the CONFIG_HTTP_SERVER_WEBSOCKET configuration is enabled.
Real-world impact
An attacker could remotely crash the device, causing a denial of service, or potentially execute malicious code to take control of the system.
Why this severity
This is a critical vulnerability because it can be exploited remotely without any user interaction or authentication, and it can lead to full system compromise.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources
Timeline
- Jun 9, 2026 · Jun 9, 2026PublishedDisclosed and added to the National Vulnerability Database.
- Jul 23, 2026 · 12d agoAdvisory updatedThe NVD record was last revised.
How it’s attacked
References & advisories
- github.com/zephyrproject-rtos/zephyr/s…exploitpatchvendor advisory