CVE-2026-93436

Summary

vLLM through 0.29.0 fails to properly clean up decode-side metadata for rejected inference requests in prefill/decode disaggregated deployments. Remote attackers can submit requests with max_tokens=0 to exhaust decode-worker memory without bound until the worker restarts.

Affected Software

Weaknesses

• CWE-401: Missing Release of Memory after Effective Lifetime

References

• https://github.com/vllm-project/vllm/pull/55677
• https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/push_worker.py#L162-L181
• https://github.com/vllm-project/vllm
• https://www.vulncheck.com/advisories/vllm-through-0.29.0-memory-exhaustion-via-rejected-requests

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