CC-4817 – F5 Releases Security Advisory for Critical Vulnerability in NGINX and NGINX Plus

Severity: Medium Successful exploitation of CVE-2026-42533 could allow an unauthenticated remote attacker to cause a denial-of-service condition or potentially achieve remote code execution on a targeted system Successful exploitation of CVE-2026-42533 could allow an unauthenticated remote attacker to cause a denial-of-service condition or potentially achieve remote code execution on a targeted system Updated: 20 Jul 2026