Check Point Advisories

Nginx Heap Overflow (CVE-2026-42945)

Vulnerability
Protection

Check Point Reference:	CPAI-2026-5215
Date Published:	14 May 2026
Severity:	Critical
Last Updated:	Sunday 24 May, 2026
Source:
Industry Reference:	CVE-2026-42945
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	NGINX Open Source 0.6.27 through 1.30.0 NGINX Plus R32 through R36 NGINX Instance Manager 2.16.0 through 2.21.1 F5 WAF for NGINX 5.9.0 through 5.12.1 NGINX App Protect WAF 4.9.0 through 4.16.0 NGINX App Protect WAF 5.1.0 through 5.8.0 F5 DoS for NGINX 4.8.0 NGINX App Protect DoS 4.3.0 through 4.7.0 NGINX Gateway Fabric 1.3.0 through 1.6.2 NGINX Gateway Fabric 2.0.0 through 2.5.1 NGINX Ingress Controller 3.5.0 through 3.7.2 NGINX Ingress Controller 4.0.0 through 4.0.1 NGINX Ingress Controller 5.0.0 through 5.4.1
Vulnerability Description	A heap overflow vulnerability in Nginx products allows unauthenticated attackers to send crafted HTTP requests to cause a heap buffer overflow in the Nginx worker process, potentially leading to a restart or, in systems with ASLR disabled, code execution.

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 Nginx Heap Overflow (CVE-2026-42945) 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: Web Server Enforcement Violation.
Attack Information: Nginx Heap Overflow (CVE-2026-42945)