ESF-IDF: Remote Null Pointer Dereference in WebSocket Server
CVE-2026-45541
7.5HIGH
What is CVE-2026-45541?
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. In versions 5.2.6, 5.3.5, 5.4.4, 5.5.4, and 6.0, a NULL-pointer dereference exists in the WebSocket subprotocol-negotiation path of the esp_http_server component. While parsing the client-supplied Sec-WebSocket-Protocol request header during the WebSocket handshake, the tokenisation result is dereferenced without a NULL check, so a malformed header value can crash the server before any application-level authentication runs. This issue has been patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.
Affected Version(s)
esp-idf = 6.0 = 6.0
esp-idf = 5.5.4 = 5.5.4
esp-idf = 5.4.4 = 5.4.4