AIKIDO-2026-613285
copier is vulnerable to Path Traversal
55
Medium Risk
This Affects:
copierTL;DR
Copier renders templates with a Jinja loader that follows {% include %} directives. When _preserve_symlinks is enabled, the loader follows a symlink whose target resolves outside the template root, reading external file contents into the generated project and recreating the symlink there. Processing an untrusted template this way discloses arbitrary local files without enabling unsafe mode. The fix replaces the unrestricted FileSystemLoader with a loader that resolves the included filename and rejects symlinks escaping the template root.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you process an untrusted template with _preserve_symlinks enabled that uses a Jinja include referencing a symlink.
Background info
copier is vulnerable to Path Traversal in versions 0.0.1 - 9.17.1.
How to fix this
Upgrade the copier library to the patch version.
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SOC 2Compliant
ISO 27001Compliant