CVE-2026-45541

ESF-IDF: Remote Null Pointer Dereference in WebSocket Server

Published Jun 10, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs 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:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Espressif
Espressif esp-idf
Vendors & Products Espressif
Espressif esp-idf
Type Values Removed Values Added
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.
Title ESF-IDF: Remote Null Pointer Dereference in WebSocket Server
Weaknesses CWE-476
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 10, 2026, 2:40 PM
Reserved
May 12, 2026, 5:48 PM
Status
Analyzed
Published
Jun 10, 2026, 2:16 AM
Modified
Jul 23, 2026, 9:10 AM