CVE-2026-5497: Vllm

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

vLLM versions 0.8.0 and later are vulnerable to an Out-of-Memory (OOM) Denial of Service (DoS) attack due to unbounded frame count processing in the `VideoMediaIO.load_base64()` method. When processing `video/jpeg` data URLs, the method splits the base64 data string on commas to extract individual JPEG frames without enforcing a frame count limit. An attacker can exploit this by crafting a single API request containing thousands of comma-separated base64-encoded JPEG frames in a data URL, causing the server to decode all frames into memory and crash due to excessive memory consumption. This vulnerability is reachable via the OpenAI-compatible chat completions API and does not require authentication.

Affected products

• Vllm Vllm: from 0.8.0, before 0.19.0 (fixed in 0.19.0)

Published 2026-06-11. Last modified 2026-07-22.