4.4

CVE-2026-34726

Exploit

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Copier-org ≫ Copier SwPlatformpython Version < 9.14.1
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.38% 0.299
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 4.4 1.8 2.5
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6
Vendor Advisory
Exploit
https://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df
Patch
https://github.com/copier-org/copier/releases/tag/v9.14.1
Release Notes