REDHAT-BUG-2491582: High severity vllm vllm vulnerability

Published Jun 22, 2026
·
Updated

vLLM is an inference and serving engine for large language models (LLMs). Prior to 0.22.0, an assert-based security check in vLLM's activation function loading allows any unauthenticated attacker to achieve arbitrary code execution on the server by publishing a malicious HuggingFace model, when vLLM runs in Python optimized mode (python -O or PYTHONOPTIMIZE=1). This vulnerability is fixed in 0.22.0.

Affected Software

1 affected component
vllm vllm<0.22.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade vLLM to a version that resolves this vulnerability.

    Fixed in 0.22.0

Event History

Jun 22, 2026
Data Sourced
via Red Hat·11:01 PM
DescriptionSeverityAffected Software
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Frequently Asked Questions

1

What is the severity of REDHAT-BUG-2491582?

The severity of REDHAT-BUG-2491582 is high, with a rating of 7.

2

How do I fix REDHAT-BUG-2491582?

To mitigate REDHAT-BUG-2491582, update vLLM to version 0.22.0 or later which includes fixes for the vulnerability.

3

What type of attack does REDHAT-BUG-2491582 allow?

REDHAT-BUG-2491582 allows unauthenticated attackers to achieve arbitrary code execution on the server.

4

What software is affected by REDHAT-BUG-2491582?

The software affected by REDHAT-BUG-2491582 is vLLM, specifically versions prior to 0.22.0.

5

What is the main issue in REDHAT-BUG-2491582?

The main issue in REDHAT-BUG-2491582 is an assert-based security check failure in vLLM's activation function loading.

Contact

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