Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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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.
Detects repeated Nginx worker process crashes terminated by signals 6 (SIGABRT) or 11 (SIGSEGV) accompanied by core dumps. High-frequency crashes originating from a single source are indicative of an adversary brute-forcing ASLR in preparation for exploitation of memory corruption vulnerabilities (e.g., buffer overflows or heap clobbering) to achieve remote code execution.
Detects instances where an nginx worker process spawns a shell interpreter, such as sh or bash. This behavior is highly irregular for a web server and is often indicative of exploitation of a remote code execution vulnerability, such as the referenced CVE-2026-42533.