Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Copier-Org | Copier | < 9.14.1 |
Related Weaknesses (CWE)
References
- https://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8cPatch
- https://github.com/copier-org/copier/releases/tag/v9.14.1Release Notes
- https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6ExploitVendor Advisory
- https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6ExploitVendor Advisory
FAQ
What is CVE-2026-34726?
CVE-2026-34726 is a vulnerability with a CVSS score of 4.4 (MEDIUM). 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 cur...
How severe is CVE-2026-34726?
CVE-2026-34726 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34726?
Check the references section above for vendor advisories and patch information. Affected products include: Copier-Org Copier.