Permissive Cross-domain Policy with Untrusted Domains Affecting vllm package, versions [,0.32.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-VLLM-21755372
- published27 Oct 2026
- disclosed26 Oct 2026
- creditJuan Pérez de Algaba, Cyrus Leung
Introduced: 26 Oct 2026
NewCVE-2026-115917 (opens in a new tab)How to fix?
Upgrade vllm to version 0.32.0 or higher.
Overview
vllm is an A high-throughput and memory-efficient inference and serving engine for LLMs
Affected versions of this package are vulnerable to Permissive Cross-domain Policy with Untrusted Domains via the default CORS configuration, which sets allowed_origins to ["*"], permitting any origin to make cross-origin requests to the server. An attacker can exploit this by luring a victim to a malicious page that issues cross-origin requests to a vllm instance, potentially reading confidential model responses or invoking API endpoints. The overly permissive default is present in both the Python CLI entrypoint (vllm/entrypoints/launchers/cli_args.py) and the Rust server configuration.
Note: This is only exploitable when no authentication token is configured (unauthenticated deployments) and when the targeted endpoints, such as dynamic LoRA routes, are enabled.