CVE-2026-116181

Medium

Description

vLLM from 0.20.1 before 0.29.0 contains an improper input validation vulnerability that allows remote attackers to crash the engine by supplying out-of-vocabulary stop_token_ids. Attackers can send OpenAI chat, completion, generate, or batch requests with invalid IDs to terminate the engine or write outside the V2 runner's logits buffer.

SeverityMedium

CVSS6.5

Exploit probability—

ProductVllm

PublishedOct 25, 2026

First seenOct 25, 2026

Weakness typeCWE-129CWE-129

How to fix

Update

vllm vllm0.29.0 or later

Vendor advisories

github.com/vllm-project/vllm/security/advisories/GHSA-w9r6-29q4-pvpr

Affected products

Product	Affected versions	Fixed in
vllm vllm	0.20.1 ≤ v < 0.29.0	0.29.0

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