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CVE-2026-34756

MEDIUM(6.5)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Risk Signal Score16/100 — NIEDRIG
  • CVSS 6.5 — Mittel

EPSS-Score

0%

Exploit-Wahrscheinlichkeit (30 Tage)

CVSS Score

6.5

Technische Schwere

Beschreibung

vLLM is an inference and serving engine for large language models (LLMs). From 0.1.0 to before 0.19.0, a Denial of Service vulnerability exists in the vLLM OpenAI-compatible API server. Due to the lack of an upper bound validation on the n parameter in the ChatCompletionRequest and CompletionRequest Pydantic models, an unauthenticated attacker can send a single HTTP request with an astronomically large n value. This completely blocks the Python asyncio event loop and causes immediate Out-Of-Memory crashes by allocating millions of request object copies in the heap before the request even reaches the scheduling queue. This vulnerability is fixed in 0.19.0.

Referenzen