CVE-2026-23986

CVE-2026-23986 · Copier safe template has arbitrary filesystem write access via directory symlinks when _preserve_symlinks: true

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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.

CVSS 6.9 · Moyenne · EPSS 0,3% · Correctif disponible

Publication

2026-01-21T22:20:37.720Z

Mise à jour

2026-01-22T16:49:26.426Z

Pile logicielle: python

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