CVE-2026-34726
Copier `_subdirectory` allows template root escape via parent-directory traversal
CVSS Score
4.4
EPSS Score
0.0%
EPSS Percentile
2th
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.
| CWE | CWE-22 |
| Vendor | copier-org |
| Product | copier |
| Published | Apr 2, 2026 |
| Last Updated | Apr 3, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
copier-org / copier
< 9.14.1