importantSYS.SOURCE: The Hacker News• 2026-07-20T02:12:49+05:30

Critical NGINX Vulnerability CVE-2026-42533 Enables Denial of Service and Potential Remote Code Execution

#vulnerability #remote code execution #denial of service #nginx #security

A critical NGINX vulnerability (CVE-2026-42533) enables denial-of-service attacks and potential remote code execution through heap buffer overflow in the script engine, requiring immediate upgrades to patched versions. Researchers highlight that mitigation strategies like switching to named captures may leave narrower attack paths unresolved.

F5 has shipped fixes for a critical nginx flaw that lets a remote, unauthenticated attacker trigger a heap buffer overflow in the worker process with crafted HTTP requests. CVE-2026-42533 was patched on July 15 in nginx 1.30.4 (stable) and 1.31.3 (mainline), and in NGINX Plus 37.0.3.1; anyone on an earlier build should upgrade.

Triggering it can crash or restart the worker, causing a denial of

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