CVE-2026-62999: Copier-Org Copier

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Copier is a library and CLI app for rendering project templates. From 9.5.0 through 9.16.0, percent-encoded parent-directory segments or encoded path separators in a template URL can match a configured trusted repository prefix before an HTTP server or Git transport decodes the path, allowing unsafe template features from a repository outside the trusted prefix to run after user interaction. This issue is fixed in version 9.17.0.

Affected products

• Copier-Org Copier: from 9.5.0, up to and including 9.16.0

Published 2026-07-31. Last modified 2026-09-09.