CVE-2026-100652: vLLM stop_token_ids validation flaw in Rust HTTP and gRPC frontends

Summary

vLLM versions 0.22.0 through 0.23.0 do not validate stop_token_ids against vocabulary bounds in the Rust HTTP and gRPC frontends, so out-of-vocabulary token IDs reach MinTokensLogitsProcessor. An attacker can send requests with min_tokens greater than zero and out-of-vocabulary stop_token_ids to trigger CUDA tensor indexing failures, which leave EngineCore in a fatal state that requires a service restart.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Topics

• Inference infrastructure

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