{"schema":"threatline.record/2","record":{"id":"CVE-2026-100651","aliases":["GHSA-3mqx-f33v-vgp9"],"summary":"vllm before 0.29.0 Denial of Service via Decoder Prompt Length Bypass","details":"vLLM before 0.29.0 fails to enforce decoder prompt-length validation on the disaggregated serving endpoint /inference/v1/generate. When the request contains a 'features' (multimodal) payload, vllm/entrypoints/serve/disagg/serving.py builds a multimodal EngineInput directly from the caller-supplied token_ids, and GenerateRequest.token_ids (vllm/entrypoints/serve/disagg/protocol.py) is not checked against model_config.max_model_len. For multimodal processors that report skip_prompt_length_check=True (for example Nemotron Parse, Whisper, and FireRedLID), InputProcessor._validate_prompt_len() returns immediately for both encoder and decoder prompts, so an overlong prompt becomes an EngineCoreRequest and reaches the worker input-batch copy into a fixed max_model_len-wide NumPy row. A client able to reach the endpoint on an affected model configuration can therefore submit an overlong token_ids list to trigger a worker failure and denial of service. Fixed in 0.29.0.","categories":["Unclassified"],"product":"vllm","vendor":"vllm-project","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100651","source_modified_at":"2026-09-28T18:25:40.222Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"vllm","vendor":"vllm-project","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"0.29.0"},{"version":"0.29.0","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100651","source_modified_at":"2026-09-28T18:25:40.222Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"vllm","ecosystem":null},"version":"0.29.0","basis":"first unaffected version stated in the CVE record"}],"cvss":7.1,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00331,"percentile":0.25084,"score_date":"2026-10-23"},"published_at":"2026-09-26T13:23:21.141Z","modified_at":"2026-09-28T18:25:40.222Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-100651","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-28T18:25:40.222Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-100651","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-3mqx-f33v-vgp9","tags":["exploit"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/vllm-before-0.29.0-denial-of-service-via-decoder-prompt-length-bypass","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-28T18:21:26.899493Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-28T18:25:40.222Z","content_hash":"62f9bbac2c00560d20fdd4f1990b4d09d8593e2d3936250a91c3a234d95cfc33"}}