CVE-2026-115918GHSA-x567-49g5-p4cf
vLLM: Responses API bypasses trust_request_chat_template for chat_template_kwargs
vllm-project vllm
CVSS
6.5MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- vllmaffected: >= 0.16.0, < 0.32.0CVE List
References 4
- github.com/vllm-project/vllm/commit/cff08b461e086523cee8bba5bd3c66d302625134Fixvia CVE List
- github.com/vllm-project/vllm/releases/tag/v0.32.0Fixvia CVE List
- github.com/vllm-project/vllm/security/advisories/GHSA-x567-49g5-p4cfAdvisoryvia CVE List
- github.com/vllm-project/vllm/pull/50300Referencevia CVE List