F5 Patches NGINX Vulnerability Enabling Code Execution and DoS Attacks

Gbhackers •Divya • June 18, 2026

F5 has released an out-of-band security notification addressing multiple high‑severity vulnerabilities in NGINX components that can enable remote code execution (RCE) and denial‑of‑service (DoS) attacks in certain configurations, urging customers to patch or upgrade affected deployments immediately. On June 17, 2026, F5 issued an out-of-band security notification (K000161614) summarizing several high- and medium-severity flaws across […]

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

F5 Issues Critical Patches for NGINX Vulnerabilities Allowing Remote Code Execution On June 17, 2026, F5 released emergency patches for two critical vulnerabilities in NGINX, CVE-2026-42530 and CVE-2026-42055. These vulnerabilities affect NGINX Open Source, NGINX Plus, and related products, allowing unauthenticated remote attackers to execute arbitrary code and cause denial-of-service (DoS) attacks. CVE-2026-42530 is a use-after-free vulnerability in the HTTP/3 module, while CVE-2026-42055 is a heap buffer overflow in the HTTP/2 and gRPC modules. Both vulnerabilities have a CVSS v4.0 score of 9.2, indicating their critical severity. F5 advises immediate patching, as exploitation could occur rapidly. The vulnerabilities impact a significant portion of the web, with NGINX running on approximately 38% of active websites worldwide. Patches are available for affected versions, and interim mitigations are suggested for those unable to update immediately. 24 sources 80

F5 Patches NGINX Vulnerability Enabling Code Execution and DoS Attacks

The full story

Extracted Entities

Attack Types (1)

Companies (1)

Tools (1)