CVE-2026-93989

Low

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.

SeverityLow

CVSS3.1

Exploit probability—

ProductVllm

PublishedSep 19, 2026

First seenSep 19, 2026

Weakness typeCWE-129CWE-129

How to fix

Update

vllm0.30.0 or later

Patches

github.com/vllm-project/vllm/pull/48824

Affected products

Product	Affected versions	Fixed in
vllm vllm	v ≤ 0.29.0	—
vllmPyPI	v < 0.30.0	0.30.0

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