CVE-2026-23968
Medium
Description
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 include arbitrary files/directories outside the local template clone location by using symlinks along with `_preserve_symlinks: false` (which is Copier's default setting). Version 9.11.2 patches the issue.
SeverityMedium
CVSS5.5
Exploit probability—
ProductCopier
PublishedJan 21, 2026
First seenJan 21, 2026
Weakness typeCWE-61CWE-61
How to fix
Update
- copier-org copier9.11.2 or later
- copier9.11.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| copier-org copier | v < 9.11.2 | 9.11.2 |
| copierPyPI | v < 9.11.2 | 9.11.2 |
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