CVE-2026-23986
HighSummary
Copier to biblioteka i aplikacja CLI do renderowania szablonów projektów. W wersjach przed 9.11.2, Copier sugerował, że generowanie projektu z bezpiecznego szablonu jest bezpieczne, jednakże bezpieczny szablon może obecnie zapisywać w dowolnych katalogach poza ścieżką docelową, wykorzystując dowiązania symboliczne oraz odpowiednią strukturę katalogów.
Risk Assessment
Złośliwy autor szablonu może stworzyć szablon, który nadpisuje dowolne pliki, co może prowadzić do poważnych problemów w systemie, w zależności od uprawnień użytkownika. To stwarza ryzyko utraty danych oraz potencjalnych ataków na system.
Recommendation
Zaleca się aktualizację do wersji 9.11.2 lub nowszej, aby załatać tę podatność. Dodatkowo, należy unikać korzystania z nieznanych lub niezweryfikowanych szablonów.
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Original NVD description (English source)
Copier is a library and CLI app for rendering project templates. Prior to version 9.11.2, Copier suggests that it's safe to generate a project from a safe template, i.e. one that doesn't use unsafe features like custom Jinja extensions which would require passing the `--UNSAFE,--trust` flag. As it turns out, a safe template can currently write to arbitrary directories outside the destination path by using directory a symlink along with `_preserve_symlinks: true` and a generated directory structure whose rendered path is inside the symlinked directory. This way, a malicious template author can create a template that overwrites arbitrary files (according to the user's write permissions), e.g., to cause havoc. Version 9.11.2 patches the issue.

