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CVE-2026-45541— ESF-IDF: Remote Null Pointer Dereference in WebSocket Server

Quick assessment

Affected
espressif esp-idf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ESP-IDF是Espressif开源的一个 Windows、Linux 和 macOS 上支持的 Espressif SoC 的开发框架。 ESP-IDF 5.2.6版本、5.3.5版本、5.4.4版本、5.5.4版本和6.0版本存在代码问题漏洞，该漏洞源于esp_http_server组件中WebSocket子协议协商路径的空指针取消引用，在解析客户端提供的Sec-WebSocket-Protocol请求标头时，令牌化结果未进行空检查即被解引用，格式错误的标头值可能导致服务器崩溃。

CVSS 7.5 · High EPSS 0.83% · P56

Affected Version Matrix 5

VendorProduct Version RangeStatus
espressif esp-idf = 6.0 affected
= 5.5.4 affected
= 5.4.4 affected
= 5.3.5 affected
= 5.2.6 affected
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I. Basic Information for CVE-2026-45541

Vulnerability Information
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Vulnerability Title
ESF-IDF: Remote Null Pointer Dereference in WebSocket Server
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
ESP-IDF 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ESP-IDF是Espressif开源的一个 Windows、Linux 和 macOS 上支持的 Espressif SoC 的开发框架。 ESP-IDF 5.2.6版本、5.3.5版本、5.4.4版本、5.5.4版本和6.0版本存在代码问题漏洞，该漏洞源于esp_http_server组件中WebSocket子协议协商路径的空指针取消引用，在解析客户端提供的Sec-WebSocket-Protocol请求标头时，令牌化结果未进行空检查即被解引用，格式错误的标头值可能导致服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
espressif esp-idf = 6.0 -

II. Public POCs for CVE-2026-45541

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III. Intelligence Information for CVE-2026-45541

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Patches & Fixes for CVE-2026-45541 (6)

Vendor Advisories for CVE-2026-45541 (1)

Same Patch Batch · espressif · 2026-06-10 · 6 CVEs total

CVE-2026-45328 9.3 CRITICAL ESF-IDF: Out-of-Bounds Write in ESP-TEE Secure Service Wrappers
CVE-2026-45542 7.1 HIGH ESF-IDF: Heap buffer overflow in protocomm Security2 over Bluetooth
CVE-2026-45329 7.1 HIGH ESF-IDF: Out-of-Bounds Read in ESP-TEE Secure Service Wrappers
CVE-2026-45160 6.5 MEDIUM ESF-IDF: Out-of-bounds Read in lwIP DHCP Server Option Parser
CVE-2026-46532 4.6 MEDIUM ESF-IDF: Heap Out-of-Bounds Read in Bluedroid AVRCP Target Parser

IV. Related Vulnerabilities

Same product: esp-idf
Same vendor: espressif
Same weakness: CWE-476

V. Comments for CVE-2026-45541

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