CVE-2026-34726
Medium · 4.4CVSS
4.4
EPSS
0.4%
Published
Apr 2, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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