Check Point Advisories

Espressif ESP-IDF Out of Bounds Write (CVE-2026-55687)

Vulnerability
Protection

Check Point Reference:	CPAI-2026-10264
Date Published:	23 Aug 2026
Severity:	High
Last Updated:	Sunday 23 August, 2026
Source:
Industry Reference:	CVE-2026-55687
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Espressif ESP-IDF 6.0.0 and later, prior to 6.0.2 Espressif ESP-IDF 5.5.0 and later, prior to 5.5.5 Espressif ESP-IDF 5.4.0 and later, prior to 5.4.5 Espressif ESP-IDF prior to 5.3.6
Vulnerability Description	An out of bounds write vulnerability in Espressif ESP-IDF allows malformed JPEG input to corrupt stack memory and reliably trigger a denial of service. This issue affects versions 6.0.0 and later, prior to 6.0.2; 5.5.0 and later, prior to 5.5.5; 5.4.0 and later, prior to 5.4.5; and versions prior to 5.3.6.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Espressif ESP-IDF Out of Bounds Write (CVE-2026-55687) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Application Servers Protection Violation.
Attack Information: Espressif ESP-IDF Out of Bounds Write (CVE-2026-55687)