Exploit for CVE-2026-7777

## https://sploitus.com/exploit?id=D97ECD90-7E3D-5571-8E84-6721918E8E81
---

## CVE-2026-7777 – Rust Use‑After‑Free in Unsafe Web Server

### **Program Code (Rust)**

```rust
// uaf_server.rs - Vulnerable Rust HTTP server with use-after-free
use std::sync::{Arc, Mutex};
use std::thread;
use std::io::prelude::*;
use std::net::{TcpListener, TcpStream};

struct SharedBuffer {
    data: Vec,
}

impl SharedBuffer {
    fn new() -> Self { SharedBuffer { data: vec![0; 1024] } }
}

fn handle_client(mut stream: TcpStream, buffer: Arc>) {
    // Simulate reading request and writing response.
    let mut buf = [0; 512];
    stream.read(&mut buf).unwrap();
    let b = buffer.lock().unwrap();
    let ptr = b.data.as_ptr() as *mut u8; // raw pointer
    // Drop the lock early? In unsafe block we might send the pointer to another thread.
    // Here we simulate a bug: the SharedBuffer is dropped, but we later use the pointer.
    drop(b);
    // After lock is released, another thread could replace the Vec, freeing the old allocation.
    // Unsafe write through the dangling pointer.
    unsafe {
        *ptr = 42; // use after free!
    }
    stream.write(b"HTTP/1.1 200 OK\r\n\r\nHello").unwrap();
}

fn main() {
    let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
    let buffer = Arc::new(Mutex::new(SharedBuffer::new()));
    for stream in listener.incoming() {
        let stream = stream.unwrap();
        let buf_clone = Arc::clone(&buffer);
        thread::spawn(move || {
            handle_client(stream, buf_clone);
        });
    }
}

```

# CVE-2026-7777 – Rust Unsafe Use‑After‑Free in Web Server

![Severity: High](https://img.shields.io/badge/severity-high-orange)

## Overview
A Rust web server uses unsafe code to share a buffer across threads. A race condition leads to a use‑after‑free, potentially causing memory corruption or information disclosure.

## Vulnerability Details
- **Type:** Use‑After‑Free (Memory Safety)
- **Impact:** Denial of Service, possible arbitrary code execution.
- **Root Cause:** A raw pointer is obtained from a `Vec` under a lock, the lock is dropped, and the vector is replaced by another thread, freeing the memory while the pointer is still used.

## Exploit Demonstration
1. Compile and run the vulnerable server:
   ```bash
   rustc uaf_server.rs
   ./uaf_server
2. Run the multi‑threaded trigger:
   ```bash
   python trigger_uaf.py