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…

在 GitHub Advisory Database 阅读

2026/10/29 06:14，GitHub Advisory Database 发布了“vLLM: DoS via unbounded chat_template Jinja2 rendering exhausts the renderer thread pool”（类型：漏洞公告）。严重程度为“中危”（medium）。相关技术：Python。CVE：CVE-2026-115911。