CVE-2026-93989

Description

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.

Affected Platforms

Weakness Type

CWE-129

References

• https://github.com/vllm-project/vllm
• https://github.com/vllm-project/vllm/blob/98dff2a81d747d1dba01a47f939f48c3526d42…
• https://github.com/vllm-project/vllm/blob/98dff2a81d747d1dba01a47f939f48c3526d42…
• https://github.com/vllm-project/vllm/pull/48824
• https://www.vulncheck.com/advisories/vllm-through-0.29.0-cross-request-logits-co…