CVE-2026-115917: vLLM: Permissive default CORS origins allow cross-origin requests to the vLLM HTTP server

CVE-2026-115917 · Severity: low · CVSS 3.4 · Published 2026-10-26

vLLM is an inference and serving engine for large language models. Prior to 0.32.0, the OpenAI-compatible server configures Starlette CORSMiddleware with allowed_origins set to a wildcard by default. A malicious web page can use a victim's browser to reach an unauthenticated vLLM server on localhost, an internal network, or a VPN, call endpoints including GET /v1/models and POST /v1/chat/completions, consume GPU resources, and read responses. Cookie-based cross-site request forgery does not apply because credentials are disabled by default, and deployments requiring bearer authentication are exposed only when the caller already has a usable token. This issue is fixed in version 0.32.0.

Technologies: vllm (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2026-115917 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-115917 being exploited in the wild.
How severe is CVE-2026-115917?
Low severity, with a CVSS score of 3.4, published 26 October 2026.
Which products and versions are affected?
vllm (PyPI) < 0.32.0, ECOSYSTEM:introduced=0,fixed=0.32.0.
Is there a fix for CVE-2026-115917?
Yes. vllm (PyPI): upgrade to 0.32.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-115917?
Check whether you run vllm (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • vllm (PyPI): upgrade to 0.32.0 or later
    pip install "vllm>=0.32.0"

Affected products

  • vllm (PyPI) < 0.32.0, ECOSYSTEM:introduced=0,fixed=0.32.0

Identifiers

  • CVE-2026-115917
  • GHSA-vvpg-rrww-wpmh
  • PYSEC-2026-4348

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