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 write to arbitrary directories outside the destination path by using directory a symlink along with `_preserve_symlinks: true` and a generated directory structure whose rendered path is inside the symlinked directory. This way, a malicious template author can create a template that overwrites arbitrary files (according to the user's write permissions), e.g., to cause havoc. Version 9.11.2 patches the issue.
INFO
Published Date :
2026-01-21T22:20:37.720Z
Last Modified :
2026-01-22T16:49:26.426Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-23986 vulnerability.
| Vendors | Products |
|---|---|
| Copier-org |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-23986.
