Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vllm | Vllm | < 0.29.0 |
Related Weaknesses (CWE)
References
- https://github.com/vllm-project/vllm/security/advisories/GHSA-wpww-v874-ph2pVendor Advisory
- https://www.vulncheck.com/advisories/vllm-before-0.29.0-cpu-exhaustion-via-unbouThird Party Advisory
FAQ
What is CVE-2026-100647?
CVE-2026-100647 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 i...
How severe is CVE-2026-100647?
CVE-2026-100647 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-100647?
Check the references section above for vendor advisories and patch information. Affected products include: Vllm Vllm.