CVE-2026-26064
HighSummary
Calibre to wieloplatformowy menedżer e-booków, który w wersjach 9.2.1 i poniżej zawiera podatność typu Path Traversal. Umożliwia to zapis dowolnych plików w lokalizacjach, gdzie użytkownik ma uprawnienia do zapisu, co na systemie Windows prowadzi do zdalnego wykonania kodu.
Risk Assessment
Organizacja może być narażona na zdalne wykonanie kodu, co może prowadzić do przejęcia kontroli nad systemem lub wycieku danych. W szczególności, atakujący może umieścić złośliwy kod w folderze uruchamiania, który zostanie wykonany przy następnym logowaniu.
Recommendation
Zaleca się aktualizację do wersji 9.3.0 lub nowszej, aby usunąć tę podatność. Dodatkowo, warto przeprowadzić audyt uprawnień do zapisu w systemie, aby zminimalizować ryzyko wykorzystania tej luki.
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Original NVD description (English source)
calibre is a cross-platform e-book manager for viewing, converting, editing, and cataloging e-books. Versions 9.2.1 and below contain a Path Traversal vulnerability that allows arbitrary file writes anywhere the user has write permissions. On Windows, this leads to Remote Code Execution by writing a payload to the Startup folder, which executes on next login. Function extract_pictures only checks startswith('Pictures'), and does not sanitize '..' sequences. calibre's own ZipFile.extractall() in utils/zipfile.py does sanitize '..' via _get_targetpath(), but extract_pictures() bypasses this by using manual zf.read() + open(). This issue has been fixed in version 9.3.0.

