CVE-2026-34730
MEDIUM
NVD
CVSS Score
5.5
Severity
MEDIUM
Published
Apr 02, 2026
Vendor
unknown
Description
Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _external_data feature allows a template to load YAML files using template-controlled paths. If untrusted templates are in scope, a malicious template can read attacker-chosen YAML-parseable local files that are accessible to the user running Copier and expose their contents in rendered output. This issue has been patched in version 9.14.1.