GHSA-4hjh-wcwx-xvwj — Axios is vulnerable to DoS attack through lack of data size check

Affected: npm: axios

## Summary

When Axios runs on Node.js and is given a URL with the `data:` scheme, it does not perform HTTP. Instead, its Node http adapter decodes the entire payload into memory (`Buffer`/`Blob`) and returns a synthetic 200 response. This path ignores `maxContentLength` / `maxBodyLength` (which only protect HTTP responses), so an attacker can supply a very large `data:` URI and cause the process to allocate unbounded memory and crash (DoS), even if the caller requested `responseType: 'stream'`.

## Details

The Node adapter (`lib/adapters/http.js`) supports the `data:` scheme. When `axios` encounters a request whose URL starts with `data:`, it does not perform an HTTP request. Instead, it calls `fromDataURI()` to decode the Base64 payload into a Buffer or Blob.

Relevant code from [`[httpAdapter](https://github.com/axios/axios/blob/c959ff29013a3bc90cde3ac7ea2d9a3f9c08974b/lib/adapters/http.js#L231)`](https://github.com/axios/axios/blob/c959ff29013a3bc90cde3ac7ea2d9a3f9c08974b/lib/adapters/http.js#L231):

```js const fullPath = buildFullPath(config.baseURL, config.url, config.allowAbsoluteUrls); const parsed = new URL(fullPath, platform.hasBrowserEnv ? platform.origin : undefined); const protocol = parsed.protocol || supportedProtocols[0];

if (protocol === 'data:') { let convertedData; if (method !== 'GET') { return settle(resolve, reject, { status: 405, ... }); } convertedData = fromDataURI(config.url, responseType === 'blob', { Blob: config.env && config.e…

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GHSA-4hjh-wcwx-xvwj — Axios is vulnerable to DoS attack through lack of data size check