CVE-2026-42946: F5 Dos

High severity, CVSS 7.4. EPSS: 0.9% chance of exploitation in the next 30 days.

A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

• F5 Dos: from 4.3.0, up to and including 4.7.0; version 4.8.0 only
• F5 Nginx Gateway Fabric: from 1.3.0, up to and including 1.6.2; from 2.0.0, up to and including 2.6.0
• F5 Nginx Ingress Controller: from 3.5.0, up to and including 3.7.2; from 4.0.0, up to and including 4.0.1; from 5.0.0, up to and including 5.4.2
• F5 Nginx Instance Manager: from 2.16.0, up to and including 2.22.0
• F5 Nginx Open Source: from 0.8.42, up to and including 0.9.7; from 1.0.0, up to and including 1.30.0
• F5 Nginx Plus: from r32, up to and including r36
• F5 Waf: from 4.9.0, up to and including 4.16.0; from 5.1.0, up to and including 5.8.0; from 5.9.0, up to and including 5.12.1

Published 2026-05-13. Last modified 2026-06-18.