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Multiple Vulnerabilities Found in nginx Web Server, Three Rated Critical by F5

F5 disclosed an out-of-band security advisory on October 14, 2026, revealing a total of 11 vulnerabilities across nginx and related products. Five issues affect the core open-source nginx server while six more impact associated offerings including NGINX Gateway Fabric and NGINX Ingress Controller. The flaws can lead to denial of service, remote code execution, authentication bypass, and sensitive information disclosure. Although the official nginx project rates all five core vulnerabilities as Medium severity, F5 assigns a CVSS v4.0 base score of 9.2 to three of them, classifying them as Critical. One example is CVE-2026-15176, a heap buffer overflow in the ngx_http_core_module that triggers under specific URL rewrite and file-path configuration settings.

Security NEXTTranslated from Japanese

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F5 has published an out-of-band security advisory detailing multiple vulnerabilities affecting the nginx web server and related products. The advisory covers five vulnerabilities in the core open-source nginx package and six additional issues in associated components, bringing the total to eleven CVEs.

The flaws expose systems to risks including service denial, remote code execution, authentication bypass, and confidential data leakage. The official nginx project website currently rates the five core vulnerabilities as Medium severity.

In contrast, F5 evaluates three of the issues with a CVSS v4.0 base score of 9.2, classifying them as Critical. Specific examples include CVE-2026-15176, a heap buffer overflow in the ngx_http_core_module that occurs under particular URL rewrite and file-path reference configurations.

Additional CVEs listed in the advisory cover the map directive and regex matching (CVE-2026-93479), further ngx_http_core_module problems (CVE-2026-97205), the ngx_http_ssl_module (CVE-2026-97629), the ngx_http_v3_module (CVE-2026-95101), and two issues in the ngx_http_js_module (CVE-2026-101025 and CVE-2026-101019).

Related products are also affected: NGINX Gateway Fabric contains CVE-2026-91184 and CVE-2026-96615, while NGINX Ingress Controller is impacted by CVE-2026-94197 and CVE-2026-104939.

NGINXCVSSv4.0CVE-2026-15176CVE-2026-93479ngx_http_core_module
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