rootpwn

medium · CVSS v3 3.7 · CVSS v4 6.3

CVE-2026-93840

vLLM before 0.29.0 validates allowed_token_ids against tokenizer length instead of model output logits width in Sampling…

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.

Scores

Severity
medium
CVSS v2
2.6
CVSS v3
3.7
CVSS v4
6.3
EPSS
—

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