F5 Patches NGINX Vulnerability That Enables Code Execution and DoS Attacks

Cybersecuritynews •Abinaya • June 18, 2026

F5 has released an out-of-band security advisory addressing multiple high-severity vulnerabilities in NGINX that could allow attackers to execute arbitrary code and launch denial-of-service (DoS) attacks across affected environments. The advisory, published on June 17, 2026, highlights several critical flaws impacting NGINX Open Source, NGINX Plus, and related products, including NGINX Gateway Fabric and NGINX […]

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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 That Enables Code Execution and DoS Attacks

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