CVE-2026-34726

MediumCVSS 4.4/10Last modified Jul 24, 2026

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.

Metrics

CVSS 3.1 4.4/10CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-22

Affected software

Vendor	Product	Versions
copier-org	copier	< 9.14.1

References

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

Timeline

Published: Apr 2, 2026
Last modified: Jul 24, 2026
NVD status: Analyzed

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