CVE-2026-100652

Medium

Description

vLLM versions 0.22.0 through 0.23.0 fail to validate stop_token_ids against vocabulary bounds in Rust HTTP and gRPC frontends, allowing out-of-vocabulary token IDs to reach MinTokensLogitsProcessor. Attackers can submit requests with min_tokens greater than zero and out-of-vocabulary stop_token_ids to trigger CUDA tensor indexing failures that leave EngineCore in a fatal state requiring service restart.

SeverityMedium

CVSS5.9

Exploit probability—

ProductVllm

PublishedSep 26, 2026

First seenSep 26, 2026

Weakness typeCWE-20Improper input validation

How to fix

Update

vllm vllm0.24.0 or later
vllm0.24.0 or later

Vendor advisories

github.com/vllm-project/vllm/security/advisories/GHSA-qff2-492f-9fm4

Affected products

Product	Affected versions	Fixed in
vllm vllm	0.22.0 ≤ v < 0.24.0	0.24.0
vllmPyPI	0.22.0 ≤ v < 0.24.0	0.24.0

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