Reference catalog of curated adversarial input payloads keyed by attack class - SQL injection, XSS, SSRF, path traversal, command injection, XXE, prototype pollution, regex DoS, Unicode confusables, header injection - plus per-context guidance for which payloads apply (URL parameter / form input / JSON body / file upload). Use when authoring negative-test cases for input validation, fuzz targets, or a security-focused test suite that needs to exercise the OWASP Top 10 attack surface.