| Title | vLLM Project vLLM 0.27.1 Asymmetric Resource Consumption |
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| Description | vLLM 0.27.1 contains an uncontrolled resource consumption vulnerability in the Rust frontend's handling of caller-supplied Jinja chat templates. The /v1/chat/completions endpoint renders the request-controlled chat_template field without an evaluation budget or equivalent computational limit. A remote attacker can submit a small specially crafted template containing nested loops that causes disproportionate CPU consumption. Concurrent malicious requests can exhaust the bounded request-runtime worker pool, resulting in denial of service for chat completion requests while health-check endpoints remain responsive. |
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| Source | ⚠️ https://github.com/vllm-project/vllm/issues/52025 |
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| User | Zyz3366 (UID 97230) |
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| Submission | 08/13/2026 17:52 (1 month ago) |
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| Moderation | 09/14/2026 09:16 (1 month later) |
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| Status | Accepted |
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| VulDB entry | 403472 [vllm-project vLLM up to 0.27.1 Jinja Template Rendering /v1/chat/completions chat_template resource consumption] |
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| Points | 20 |
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