CVE-2026-34730

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.

CVSS Vector

References

• https://github.com/copier-org/copier/commit/5413062eb17b73dc885f5e645cdc161e69ef641b
• https://github.com/copier-org/copier/releases/tag/v9.14.1
• https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h
• https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h