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Allocation of Resources Without Limits or Throttling Affecting vllm-openai-cuda-12.9 package, versions <0.19.0-r0

Severity

 Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.42% (36th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-VLLMOPENAICUDA129-16000075
  • published13 Apr 2026
  • disclosed6 Apr 2026
Report a new vulnerability Found a mistake?

Introduced: 6 Apr 2026

CVE-2026-34756  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Chainguard vllm-openai-cuda-12.9 to version 0.19.0-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream vllm-openai-cuda-12.9 package and not the vllm-openai-cuda-12.9 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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.