Copier `_subdirectory` allows template root escape via parent-directory traversal

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-34726
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-02 19:21:32 UTC
Updated2026-04-02 19:21:32 UTC
DescriptionCopier 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.

Risk And Classification

Primary CVSS: v3.1 4.4 MEDIUM from [email protected]

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

Problem Types: CWE-22 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
3.1CNADECLARED4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Copier-org Copier affected < 9.14.1 Not specified

References

ReferenceSourceLinkTags
github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8c... [email protected] github.com
github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6 [email protected] github.com
github.com/copier-org/copier/releases/tag/v9.14.1 [email protected] github.com
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