vLLM 0.22.0 through 0.23.0 Denial of Service via stop_token_ids

Advisories

vLLM 0.22.0 through 0.23.0 Denial of Service via stop_token_ids

severity: high
date: 9/26/2026
Affecting: vllm >= 0.22.0, < 0.24.0
CVE: CVE-2026-100652
CWE: CWE-20 Improper Input Validation
CVSS: 8.2
CVSS V4 Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References: GitHub Security Advisory (GHSA-qff2-492f-9fm4)
Credit: rexpository, jperezdealgaba
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.

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