Is CVE-2026-45541 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-45541 being exploited in the wild.

How severe is CVE-2026-45541?

High severity, with a CVSS score of 7.5, published 10 June 2026.

Which products and versions are affected?

Espressif Systems ESP-IDF 5.2.6, 5.3.5, 5.4.4, 5.5.4, 6.0.

Is there a fix for CVE-2026-45541?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-45541 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-45541?

Check whether you run Espressif Systems ESP-IDF at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-45541: Espressif ESP-IDF NULL pointer dereference in esp_http_server

CVE-2026-45541 · Severity: high · CVSS 7.5 · Published 2026-06-10

Espressif ESP-IDF is a development framework used to build software for Internet of Things (IoT) devices. A flaw in its built-in web server component allows an attacker to crash the device remotely by sending a specially crafted network request. This can lead to a complete service outage for the affected IoT device before any security login or authentication occurs.

Technologies: Espressif Systems ESP-IDF. Vendors: Espressif Systems.

Quick answers

Is CVE-2026-45541 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-45541 being exploited in the wild.
How severe is CVE-2026-45541?: High severity, with a CVSS score of 7.5, published 10 June 2026.
Which products and versions are affected?: Espressif Systems ESP-IDF 5.2.6, 5.3.5, 5.4.4, 5.5.4, 6.0.
Is there a fix for CVE-2026-45541?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-45541 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-45541?: Check whether you run Espressif Systems ESP-IDF at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A NULL-pointer dereference (CWE-476) exists in the 'esp_http_server' component of the ESP-IDF framework. The vulnerability is located within the 'httpd_ws_get_response_subprotocol' function in 'httpd_ws.c', where the result of a 'strtok_r' operation on the 'Sec-WebSocket-Protocol' request header is dereferenced without a prior NULL check. An unauthenticated remote attacker can exploit this by sending a malformed WebSocket handshake request, causing the server to crash (Denial of Service). The issue is patched in versions 5.2.7, 5.3.6, 5.4.5, 5.5.5, and 6.0.1.

Affected products

Espressif Systems ESP-IDF 5.2.6, 5.3.5, 5.4.4, 5.5.4, 6.0

Timeline

2026-05-15: advisory: GitHub Security Advisory GHSA-3j8v-xgrq-5vg8 published
2026-06-10: disclosed: CVE-2026-45541 published to NVD

References

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