nginx Server Header Discloses Vulnerable Version (CVE-2026-42533)

Georgios Maragos@Gmarak

•updated Jul 28, 2026•6•0•28

Detects an nginx HTTP Server response header containing a version number identified as vulnerable to CVE-2026-42533 (specifically 0.9.6 through 1.30.3, or 1.31.0 through 1.31.2). This rule identifies potentially exposed or unpatched infrastructure that may be susceptible to exploitation.