6.5
MediumCVSS 3.1 · from GitHub_M
CVE-2026-115918
vLLM: Responses API bypasses trust_request_chat_template for chat_template_kwargs
vllm · Uncontrolled resource use · CWE-400Affectedvllm
FixNo fix listed yet.
PublishedOct 26, 17:21 · GitHub_M
ScoredOct 26 · 6.5 · GitHub_M
Exploit code publicNone known · checked 21:18 UTC
ExploitedNone known · CISA KEV checked 22:11 UTC
What we know
No known exploitation. CISA KEV, checked 22:11 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 21:18 UTC.
An attacker needs network access and an account. CVSS: network, low privileges.
A successful attack can take the service down. CVSS impact.
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.
From GitHub_M
Affected and fixed versions
ProductAffectedFixed invllm>= 0.16.0, < 0.32.0–
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known