PYSEC-2026-2134

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...

CVE-2026-34726 Copier `_subdirectory` allows template root escape via parent-directory traversal

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...