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Vulnerability · Published Jun 22, 2026 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity code injection in vllm from vllm-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.9%top 39.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIvllm0.22.0GHSA-q8gq-377p-jq3r
PyPIvllm0.22.0PYSEC-2026-2300

Affected products (as reported)

VendorProductVersions
vllm-project vllm < 0.22.0

Weakness: CWE-94, CWE-617 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References