GHSA-pq5c-rjhq-qp7p: vLLM: Denial of Service via Unbounded Frame Count in video/jpeg Base64 Processing

vLLM's `VideoMediaIO.load_base64()` method has a vulnerability where it processes `video/jpeg` data URLs (a vLLM-specific format for sending multiple JPEG frames) without limiting how many frames can be included. An attacker can send thousands of comma-separated base64-encoded JPEG frames in a single API request, causing the server to decode all of them into memory at once and crash due to running out of memory (OOM, or out-of-memory error).