Medium severity4.4NVD Advisory· Published Apr 2, 2026· Updated Apr 3, 2026
CVE-2026-34726
CVE-2026-34726
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
copierPyPI | < 9.14.1 | 9.14.1 |
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3dfnvdPatchWEB
- github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-85v3-4m8g-hrh6ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-34726ghsaADVISORY
- github.com/copier-org/copier/releases/tag/v9.14.1nvdRelease NotesWEB
News mentions
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