CVE-2026-41523 – vLLM: Security Check Bypass via assert Statement in Activation Function Loading Allows Arbitrary Code Execution

CVE ID :CVE-2026-41523

Published : June 22, 2026, 10:18 p.m. | 1 hour, 25 minutes ago

Description :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.

Severity: 0.0 | NA

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