CVE-2026-100647: vLLM denial of service through oversized cache_salt parameter

Summary

vLLM versions before 0.29.0 have a denial-of-service flaw in the cache_salt parameter accepted on OpenAI-compatible and Anthropic API endpoints. The parameter has no maximum length validation and is processed on the single EngineCore scheduler thread. Unauthenticated attackers can send multi-hundred-megabyte salt values that trigger expensive pickle serialization and SHA-256 hashing, stalling the scheduler and denying service to all concurrent requests.

Mitigation

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

Topics

• Inference infrastructure

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