CVE-2026-23968
MEDIUM
GHSA-xjhm-gp88-8pfx
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Lifecycle Timeline
4Description
Copier is a library and CLI app for rendering project templates. Prior to version 9.11.2, Copier suggests that it's safe to generate a project from a safe template, i.e. one that doesn't use unsafe features like custom Jinja extensions which would require passing the `--UNSAFE,--trust` flag. As it turns out, a safe template can currently include arbitrary files/directories outside the local template clone location by using symlinks along with `_preserve_symlinks: false` (which is Copier's default setting). Version 9.11.2 patches the issue.
Analysis
Copier versions before 9.11.2 allow local attackers to read arbitrary files outside the template directory by exploiting symlink handling when the default `_preserve_symlinks: false` setting is enabled, bypassing the library's safety guarantees for templates that don't require the unsafe flag. An attacker with local access can leverage this to access sensitive files through a malicious or compromised template. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.
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External POC / Exploit Code
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