CVE-2026-100647: Vllm

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

vLLM versions before 0.29.0 contain a denial-of-service vulnerability in the cache_salt parameter accepted on OpenAI-compatible and Anthropic API endpoints, which lacks maximum length validation and is processed on the single EngineCore scheduler thread. Unauthenticated attackers can send HTTP requests with multi-hundred-megabyte salt values that trigger expensive pickle serialization and SHA-256 hashing, stalling the scheduler thread and denying service to all concurrent requests.

Affected products

• Vllm Vllm: before 0.29.0 (fixed in 0.29.0)

Published 2026-09-26. Last modified 2026-10-06.