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CVE PROGRAM SOURCE RECORD4.4 Medium

CVE-2026-34726

Copier `_subdirectory` allows template root escape via parent-directory traversal

Description

Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as .. and uses it directly when selecting the template root. As a result, a template can escape its own directory and make Copier render files from the parent directory without --UNSAFE. This issue has been patched in version 9.14.1.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

copier-org copier

  • < 9.14.1affected

References