CVE-2026-93989: Vllm

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 30 days.

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 products

• Vllm Vllm: up to and including 0.29.0

Published 2026-09-19. Last modified 2026-09-28.