CVE-2026-27893

# Proof of Concept (Conceptual) # This PoC demonstrates the bypass of trust_remote_code=False. # It requires a malicious model repository structure. import os from vllm import LLM # Simulate a malicious model path (attacker controlled) malicious_model_path = "./malicious_model_repo" # The user explicitly sets trust_remote_code to False to prevent RCE print("Attempting to load model with trust_remote_code=False...") try: # In vulnerable versions (0.10.1 - <0.18.0), the hardcoded value inside # specific model implementations overrides this user setting. llm = LLM( model=malicious_model_path, trust_remote_code=False, # Security opt-out download_dir="./tmp" ) print("Model loaded. If vulnerable, code from the model repo has already executed.") except Exception as e: print(f"Error: {e}") # Expected behavior in vulnerable versions: # The code inside 'malicious_model_repo/modeling_malicious.py' would execute # regardless of the trust_remote_code=False flag.

{"cve": {"id": "CVE-2026-27893", "sourceIdentifier": "[email protected]", "published": "2026-03-27T00:16:22.333", "lastModified": "2026-03-30T18:56:21.730", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "vLLM is an inference and serving engine for large language models (LLMs). Starting in version 0.10.1 and prior to version 0.18.0, two model implementation files hardcode `trust_remote_code=True` when loading sub-components, bypassing the user's explicit `--trust-remote-code=False` security opt-out. This enables remote code execution via malicious model repositories even when the user has explicitly disabled remote code trust. Version 0.18.0 patches the issue."}, {"lang": "es", "value": "vLLM es un motor de inferencia y servicio para modelos de lenguaje grandes (LLM). A partir de la versión 0.10.1 y antes de la versión 0.18.0, dos archivos de implementación de modelos codifican de forma rígida 'trust_remote_code=True' al cargar subcomponentes, eludiendo la exclusión voluntaria de seguridad explícita del usuario '--trust-remote-code=False'. Esto permite la ejecución remota de código a través de repositorios de modelos maliciosos incluso cuando el usuario ha deshabilitado explícitamente la confianza en el código remoto. La versión 0.18.0 corrige el problema."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-693"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*", "versionStartIncluding": "0.10.1", "versionEndExcluding": "0.18.0", "matchCriteriaId": "2130385B-68E6-4854-AC42-0CBA1F30B487"}]}]}], "references": [{"url": "https://github.com/vllm-project/vllm/commit/00bd08edeee5dd4d4c13277c0114a464011acf72", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/vllm-project/vllm/pull/36192", "source": "[email protected]", "tags": ["Issue Tracking"]}, {"url": "https://github.com/vllm-project/vllm/security/advisories/GHSA-7972-pg2x-xr59", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}