CVE-2026-45541

HIGH

Espressif ESP-IDF WebSocket Server - NULL Pointer Dereference

Title source: manual
STIX 2.1

Description

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.

References (7)

Core 7
Core References

Scores

CVSS v3 7.5
EPSS 0.0044
EPSS Percentile 34.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-476
Status published
Products (10)
espressif/esp-idf 5.2.6
espressif/esp-idf 5.3.5
espressif/esp-idf 5.4.4
espressif/esp-idf 5.5.4
espressif/esp-idf 6.0
espressif/esp-idf = 5.2.6
espressif/esp-idf = 5.3.5
espressif/esp-idf = 5.4.4
espressif/esp-idf = 5.5.4
espressif/esp-idf = 6.0
Published Jun 10, 2026
Tracked Since Jun 10, 2026