vLLM: DoS via unbounded chat_template Jinja2 rendering exhausts the renderer thread pool

影響: pip:vllm >= 0.19.0, < 0.32.0 → 0.32.0

vLLM renders chat templates by passing the resolved Jinja2 source to tokenizer.apply_chat_template(), which compiles and .render()s it in an ImmutableSandboxedEnvironment. The sandbox prevents code-execution escapes but imposes no wall-clock timeout, no output-size cap, and no nested-loop or binop limit. The render runs in a ThreadPoolExecutor whose max_workers defaults to 1, and CPython worker threads cannot be interrupted. An authenticated API client (or a malicious model repo loaded with tru…

GitHub Advisory Databaseで読む

2026/10/29 06:14、GitHub Advisory Databaseが「vLLM: DoS via unbounded chat_template Jinja2 rendering exhausts the renderer thread pool」を公開しました (種別: 脆弱性アドバイザリ)。重大度は「警告」(medium) です。関連する技術: Python。CVE: CVE-2026-115911。