{"schema":"threatline.record/2","record":{"id":"CVE-2026-115911","aliases":["GHSA-542m-9234-8gvf"],"summary":"vLLM: DoS via unbounded chat_template Jinja2 rendering exhausts the renderer thread pool","details":"vLLM is an inference and serving engine for large language models. From 0.19.0 until 0.32.0, authenticated callers can supply a request chat template when no server-side --chat-template is configured, or a malicious model repository can provide a template that is compiled and rendered by tokenizer.apply_chat_template() without a wall-clock timeout, output-size limit, or iteration bound. Rendering runs in a ThreadPoolExecutor with one worker by default, so a nonterminating render can block /v1/responses and other chat-template users after the request ends, while an output-expanding render can exhaust server memory. Harmony models are not affected because they do not use this Jinja path. This issue is fixed in version 0.32.0.","categories":["Unclassified"],"product":"vllm","vendor":"vllm-project","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115911","source_modified_at":"2026-10-26T16:47:59.377Z","fetched_at":"2026-10-26T19:10:57.178988Z","product":"vllm","vendor":"vllm-project","versions":[{"version":">= 0.19.0, < 0.32.0","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":6.5,"severity":"Medium","kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-26T16:47:59.377Z","modified_at":"2026-10-26T16:47:59.377Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-115911","fetched_at":"2026-10-26T19:10:57.178988Z","source_modified_at":"2026-10-26T16:47:59.377Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-542m-9234-8gvf","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/vllm-project/vllm/pull/50300","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/vllm-project/vllm/commit/cff08b461e086523cee8bba5bd3c66d302625134","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/vllm-project/vllm/releases/tag/v0.32.0","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-26T16:47:59.377Z","content_hash":"07e4231f689d7a166b056f4dc14a1172a5aa97624ddf27ac95f61d89711074a3"}}