PIP · JUNE 2026 · EARLY WARNING

Potential Auth Bypass in vLLM Affecting OpenAI API

EARLY WARNING · UNCONFIRMED. This page describes a developing threat that 0Day surfaced from early signals and has not yet independently confirmed. Details may change. Always verify against the primary sources before acting.
GHSA-94F4-HR76-P5J6Severity: HIGH

An early warning has been issued regarding a potential vulnerability in vLLM that may allow bypassing authentication for the OpenAI API. Users of vLLM versions prior to 0.14.1 are reportedly affected.

What happened

An early warning has been issued about a potential vulnerability tracked as GHSA-94F4-HR76-P5J6, which reportedly affects vLLM versions prior to 0.14.1. This vulnerability appears to enable an authentication bypass of the OpenAI API `AuthenticationMiddleware`, allowing use of the API without providing the configured `VLLM_API_KEY` or `--api-key`.

The issue is under investigation, and it is recommended that users upgrade to vLLM version 0.14.1 or later to mitigate the potential authentication bypass vulnerability. The exact details and severity of the impact are still being assessed, and primary sources should be consulted for the most current information.

Professional software engineers are advised to review their use of vLLM and assess whether they are running a vulnerable version. If so, immediate upgrade to the latest version is recommended as a precautionary measure.

How 0Day mitigates this

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Read how this differs from waiting on a scanner to catch a known advisory, or see the exact, read-only access 0Day needs to do this for an organization.

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