{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93840", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-09-18T18:16:47.489Z", "datePublished": "2026-09-18T19:06:06.001Z", "dateUpdated": "2026-09-18T19:06:06.001Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-18T19:06:06.001Z"}, "datePublic": "2026-07-19T00:00:00.000Z", "title": "vLLM before 0.29.0 Cross-Request Logits Corruption via allowed_token_ids", "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Improper Validation of Array Index", "cweId": "CWE-129", "type": "CWE"}]}], "affected": [{"vendor": "vllm-project", "product": "vllm", "defaultStatus": "unaffected", "packageURL": "pkg:pypi/vllm", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThan": "0.29.0"}, {"version": "0.29.0", "status": "unaffected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*", "versionEndExcluding": "0.29.0"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "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", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 6.3, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW"}}], "references": [{"url": "https://github.com/vllm-project/vllm/pull/49080", "tags": ["patch", "issue-tracking"]}, {"url": "https://github.com/vllm-project/vllm", "tags": ["product"]}, {"url": "https://github.com/vllm-project/vllm/commit/5b0e5b69ac1a3884a6479c9537789c95263cc804", "tags": ["patch"]}, {"url": "https://github.com/vllm-project/vllm/blob/v0.28.0/vllm/sampling_params.py#L881-L903", "tags": ["technical-description"]}, {"url": "https://github.com/vllm-project/vllm/blob/v0.28.0/vllm/v1/worker/gpu/sample/logit_bias.py#L179-L191", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: vLLM before 0.29.0 Cross-Request Logits Corruption via allowed_token_ids", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/vllm-before-0.29.0-cross-request-logits-corruption-via-allowed-token-ids"}], "credits": [{"lang": "en", "value": "Mingkai Yu", "type": "reporter"}, {"lang": "en", "value": "Jiapeng Li", "type": "reporter"}, {"lang": "en", "value": "Jiajia Liu", "type": "reporter"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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