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CRITICAL Vulnerabilities

NGINX heap buffer overflow bug patched for CVE-2026-42533 in nginx and NGINX Plus

Source headline: Critical NGINX Vulnerability Can Crash Workers and May Allow Remote Code Execution

Threat level Critical
Signal strength 85/100
Source confidence 1 source
Published 22 hours ago

Intelligence Summary

F5 fixed a critical NGINX vulnerability that can be triggered remotely without authentication. The flaw causes a heap buffer overflow in the worker process via crafted HTTP requests. Successful exploitation can crash or restart workers, leading to denial-of-service and service instability. The issue is tracked as CVE-2026-42533. Administrators should upgrade to the fixed versions: nginx 1.30.4 (stable), 1.31.3 (mainline), and NGINX Plus 37.0.3.1.

Recommended Action

Prioritize immediate review, validate exposure, and patch or mitigate affected systems.

Topics

#nginx #remote-execution #denial-of-service #cve-2026-42533 #heap-buffer-overflow
Original reporting The Hacker News Critical NGINX Vulnerability Can Crash Workers and May Allow Remote Code Execution
Open original source

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