GHSA-m3wp-48jr-vr4g

## Unbounded Remote Media Fetch and Video Frame Expansion DoS ### Summary The `POST /v1/chat/completions` endpoint in mistral.rs fetches attacker-supplied media URLs (image, audio, video) into server memory with no byte limit, and extracts every frame of a supplied video when `num_frames` is `None`. An unauthenticated remote attacker can exhaust server memory, disk space, and CPU by pointing the endpoint at an infinite-streaming HTTP server or a long high-framerate video, causing a complete denial of service. No credentials or special configuration are required; the route is open by default. ### Details Three independent sinks contribute to the vulnerability: **1. Unbounded image/audio fetch (`mistralrs-server-core/src/util.rs:59–62`)** ```rust let bytes = if url.scheme() == "http" || url.scheme() == "https" { match reqwest::get(url.clone()).await { Ok(http_resp) => http_resp.bytes().await?.to_vec(), // no byte cap Err(e) => anyhow::bail!(e), } ``` `bytes().await` buffers the entire HTTP response body before returning. There is no `Content-Length` check, no streaming limit, and no timeout specific to the media fetch. An attacker-controlled server that never closes the connection causes the server process to accumulate memory indefinitely. **2. Unbounded video fetch (`mistralrs-server-core/src/video.rs:65–69`)** ```rust let bytes = if url.scheme() == "http" || url.scheme() == "https" { let resp = reqwest::get(url.clone()) .await .context(format!("Failed to fetch video: {url}"))?; resp.bytes().await?.to_vec() // no byte cap ``` Identical pattern to the image path; the full video body is buffered into a `Vec<u8>`. **3. Unbounded FFmpeg frame extraction (`mistralrs-server-core/src/video.rs:225–248`)** ```rust } else { let mut command = tokio::process::Command::new("ffmpeg"); command .arg("-i") .arg(input_path.to_str().unwrap()) .arg("-vsync") .arg("vfr") .arg(&outpu