Critical NGINX Vulnerability May Enable Worker Process Crashes

A newly disclosed NGINX vulnerability, tracked as CVE-2026-42533, reportedly exposes certain deployments to serious denial-of-service risks through specially crafted HTTP requests.

What Is Affected?

According to the advisory, the flaw affects NGINX installations using specific regular-expression-based map configurations. An unauthenticated attacker may exploit the issue to crash worker processes, potentially disrupting affected web services.

Potential Remote Code Execution

F5 also warns that the vulnerability may permit pre-authentication remote code execution in environments where Address Space Layout Randomization (ASLR) is disabled or successfully bypassed. Administrators should review their configurations, monitor official security guidance, and apply available mitigations or updates promptly.

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