CVE-2026-34726

Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as .. and uses it directly when selecting the template root. As a result, a template can escape its own directory and make Copier render files from the parent directory without --UNSAFE. This issue has been patched in version 9.14.1.

• CWE-22

• https://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3dfPatch
• https://github.com/copier-org/copier/releases/tag/v9.14.1Release Notes
• https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6Exploit, Vendor Advisory
• https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6Exploit, Vendor Advisory

Published

Apr 2, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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