{"id":"CVE-2026-115918","state":"PUBLISHED","title":"vLLM: Responses API bypasses trust_request_chat_template for chat_template_kwargs","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.","publishedAt":"2026-10-26T17:21:49.719Z","updatedAt":"2026-10-30T14:22:20.698Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["vllm-project vllm"],"affected":[{"vendor":"vllm-project","product":"vllm","versions":[{"version":">= 0.16.0, < 0.32.0","status":"affected"}]}],"references":["https://github.com/vllm-project/vllm/security/advisories/GHSA-x567-49g5-p4cf","https://github.com/vllm-project/vllm/pull/50300","https://github.com/vllm-project/vllm/commit/cff08b461e086523cee8bba5bd3c66d302625134","https://github.com/vllm-project/vllm/releases/tag/v0.32.0"],"weaknesses":["CWE-400","CWE-770"],"ingestedAt":"2026-10-30T14:28:06.795Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/115xxx/CVE-2026-115918.json","commit":"03ee80f5da31e6cc15e39ca4963953877c90d569","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-115918","state":"PUBLISHED","datePublished":"2026-10-26T17:21:49.719Z","dateUpdated":"2026-10-30T14:22:20.698Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-23T20:21:45.107Z"},"containers":{"cna":{"title":"vLLM: Responses API bypasses trust_request_chat_template for chat_template_kwargs","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"vllm-project","product":"vllm","versions":[{"version":">= 0.16.0, < 0.32.0","status":"affected"}]}],"references":[{"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-x567-49g5-p4cf","name":"https://github.com/vllm-project/vllm/security/advisories/GHSA-x567-49g5-p4cf","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/vllm-project/vllm/pull/50300","name":"https://github.com/vllm-project/vllm/pull/50300","tags":["x_refsource_MISC"]},{"url":"https://github.com/vllm-project/vllm/commit/cff08b461e086523cee8bba5bd3c66d302625134","name":"https://github.com/vllm-project/vllm/commit/cff08b461e086523cee8bba5bd3c66d302625134","tags":["x_refsource_MISC"]},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.32.0","name":"https://github.com/vllm-project/vllm/releases/tag/v0.32.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","lang":"en","description":"CWE-400: Uncontrolled Resource Consumption","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-26T17:21:49.719Z"},"source":{"advisory":"GHSA-x567-49g5-p4cf","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-30T14:22:12.561297Z","id":"CVE-2026-115918","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-30T14:22:20.698Z"}}]}}}