{"id":"CVE-2026-93840","revision":"5a07a637ea0047eebd8c438eeb9f8cbc","records":[{"revision":"5a07a637ea0047eebd8c438eeb9f8cbc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93840","aliases":[],"title":"vLLM before 0.29.0 Cross-Request Logits Corruption via allowed_token_ids","description":"vLLM before 0.29.0 validates allowed_token_ids against tokenizer length instead of model output logits width in SamplingParams._validate_allowed_token_ids(). Attackers can supply token IDs above the output vocabulary that pass validation, causing LogitBiasState to corrupt GPU logits state and allow concurrent requests to sample tokens outside their allowlists.","state":0,"publishedAt":"2026-09-18T19:06:06.001+00:00","modifiedAt":"2026-09-24T14:23:15.056+00:00","affected":[{"ecosystem":"Vendor product","name":"vllm","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"vllm-project\",\n                    \"product\": \"vllm\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:pypi/vllm\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"0.29.0\"\n                        },\n                        {\n                            \"version\": \"0.29.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","score":6.3,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","score":3.7,"severity":"LOW"}],"references":["https://github.com/vllm-project/vllm/pull/49080","https://github.com/vllm-project/vllm","https://github.com/vllm-project/vllm/commit/5b0e5b69ac1a3884a6479c9537789c95263cc804","https://github.com/vllm-project/vllm/blob/v0.28.0/vllm/sampling_params.py#L881-L903","https://github.com/vllm-project/vllm/blob/v0.28.0/vllm/v1/worker/gpu/sample/logit_bias.py#L179-L191","https://www.vulncheck.com/advisories/vllm-before-0.29.0-cross-request-logits-corruption-via-allowed-token-ids"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93840","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93840","identifiers":["CVE-2026-93840"]},"retained":false,"historicalAffected":[]}],"coverage":[]}