CVE-2026-115918
vLLM: Responses API bypasses trust_request_chat_template for chat_template_kwargs
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 CWE-770 |
| Vendor | vllm-project |
| Product | vllm |
| Published | Oct 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
vllm-project / vllm
>= 0.16.0, < 0.32.0
References
github.com: https://github.com/vllm-project/vllm/security/advisories/GHSA-x567-49g5-p4cf github.com: https://github.com/vllm-project/vllm/pull/50300 github.com: https://github.com/vllm-project/vllm/commit/cff08b461e086523cee8bba5bd3c66d302625134 github.com: https://github.com/vllm-project/vllm/releases/tag/v0.32.0