CVE-2026-45541

Severity CVSS v4.0:

Pending analysis

Type:

CWE-476 NULL Pointer Dereference

Publication date:

10/06/2026

Last modified:

11/06/2026

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.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

7.50

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:espressif:esp-idf:5.2.6:::::::*
cpe:2.3:a:espressif:esp-idf:5.3.5:::::::*
cpe:2.3:a:espressif:esp-idf:5.4.4:::::::*
cpe:2.3:a:espressif:esp-idf:5.5.4:::::::*
cpe:2.3:a:espressif:esp-idf:6.0:::::::*

To consult the complete list of CPE names with products and versions, see this page

CPE	From	Up to
cpe:2.3:a:espressif:esp-idf:5.2.6:::::::*
cpe:2.3:a:espressif:esp-idf:5.3.5:::::::*
cpe:2.3:a:espressif:esp-idf:5.4.4:::::::*
cpe:2.3:a:espressif:esp-idf:5.5.4:::::::*
cpe:2.3:a:espressif:esp-idf:6.0:::::::*

CVE-2026-45541

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools