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6.3 Medium

CVE-2026-93840 vLLM before 0.29.0 validates allowed_token_ids against tokenizer length instead of model output logits width in…

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.

Affected products and versions

Product Affected versions Fixed in
vllm 0.29 earliest → < 0.29.0 0.29.0

References

Timeline

  1. Published
  2. Last modified

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