MEDIUM4.3
PYSEC-2026-4000
Quick fix
PYSEC-2026-4000 — vllm: upgrade to the fixed version with the command below.
pip install --upgrade 'vllm>=0.30.0'Details
vLLM through 0.29.0 fails to properly validate bad_words token indices against the model's generation output width in SamplingParams.update_from_tokenizer(). Attackers can supply out-of-bounds token indices that corrupt logits memory of concurrent requests, causing different in-flight HTTP requests to return incorrect tokens.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://github.com/vllm-project/vllm/blob/98dff2a81d747d1dba01a47f939f48c3526d4206/vllm/sampling_params.py#L694-L753[WEB]
- https://github.com/vllm-project/vllm/blob/98dff2a81d747d1dba01a47f939f48c3526d4206/vllm/v1/worker/gpu/sample/bad_words.py[WEB]
- https://www.vulncheck.com/advisories/vllm-through-0.29.0-cross-request-logits-corruption-via-bad-words[ADVISORY]
- https://github.com/vllm-project/vllm/pull/48824[FIX]
- https://github.com/vllm-project/vllm[PACKAGE]