ESF-IDF: Remote Null Pointer Dereference in WebSocket Server_CVE-2026-45541

7.5 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Basic Information

ID CVE-2026-45541

Source GitHub_M

Published Jun 10, 2026 at 00:25

Affected Product

Vendor espressif

Product esp-idf

Version = 6.0

Affected Versions espressif esp-idf = 6.0
espressif esp-idf = 5.5.4
espressif esp-idf = 5.4.4
espressif esp-idf = 5.3.5
espressif esp-idf = 5.2.6

CWE Classification

CWE-476

References

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    "published": "2026-06-10T00:25:59.233Z",
    "modified": "2026-06-10T00:25:59.233Z",
    "type": "cve",
    "title": "ESF-IDF: Remote Null Pointer Dereference in WebSocket Server",
    "source": "GitHub_M",
    "references": "https://github.com/espressif/esp-idf/security/advisories/GHSA-3j8v-xgrq-5vg8\nhttps://github.com/espressif/esp-idf/commit/00a2f7fbbbd8fe6d04729022e1d5c9a49435bfe8\nhttps://github.com/espressif/esp-idf/commit/0dc4ee7537f3b12350f5966cecacd59bba840ec6\nhttps://github.com/espressif/esp-idf/commit/37508ab91124ef426a7396d30f79eba1162700c7\nhttps://github.com/espressif/esp-idf/commit/9fc0ca13b3b85b98d32b98cd9dc8ff9d82642b7b\nhttps://github.com/espressif/esp-idf/commit/dc46dc51359749e50617eb70d6f9ae298adc4fff\nhttps://github.com/espressif/esp-idf/commit/f88a47e4f37fb11ae4b0908cd5c80059d83198c6",
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