CVE-2026-115918

Medium

Description

vLLM is an inference and serving engine for large language models. From 0.16.0 until 0.32.0, the /v1/responses endpoint allows an authenticated caller to place an attacker-controlled template in chat_template_kwargs[chat_template] when no server template is configured. ChatParams.get_apply_chat_template_kwargs() preserves that value without enforcing trust_request_chat_template, so the request can bypass the intended trust policy and cause CPU or memory exhaustion through Jinja rendering. This issue is fixed in version 0.32.0.

SeverityMedium

CVSS6.5

Exploit probability—

ProductVllm

PublishedOct 26, 2026

First seenOct 26, 2026

Weakness typeCWE-400Uncontrolled resource consumption CWE-770Allocation of resources without limits

How to fix

Update

vllm vllm0.32.0 or later
vllm0.32.0 or later

Affected products

Product	Affected versions	Fixed in
vllm vllm	0.16.0 ≤ v < 0.32.0	0.32.0
vllmPyPI	0.16.0 ≤ v < 0.32.0	0.32.0

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