CVE-2025-55201: Copier-Org Copier

High severity, CVSS 8.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Copier library and CLI app for rendering project templates. Prior to 9.9.1, a safe template can currently read and write arbitrary files because Copier exposes a few pathlib.Path objects in the Jinja context which have unconstrained I/O methods. This effectively renders the security model w.r.t. filesystem access useless. This vulnerability is fixed in 9.9.1.

Affected products

• Copier-Org Copier: before 9.9.1 (fixed in 9.9.1)

Published 2025-08-18. Last modified 2026-06-17.