CVE-2026-23986 Copier safe template has arbitrary filesystem write access via directory symlinks when _preserve_symlinks: true

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...

CVE-2026-23986

CVE-2026-23986 affects Copier (library and CLI). A safe template can still write outside the destination when using a symlink and _preserve_symlinks: true, enabling a malicious template to overwrite arbitrary files within the user’s write permissions. This risk exists prior to version 9.11.2 and ...

CVE-2026-23986 Copier safe template has arbitrary filesystem write access via directory symlinks when _preserve_symlinks: true

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...

CVE-2026-23986 Copier safe template has arbitrary filesystem write access via directory symlinks when _preserve_symlinks: true

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...

EUVD-2026-4141

Copier safe template has arbitrary filesystem write access via directory symlinks when preservesymlinks: true...

GHSA-4FQP-R85R-HXQH Copier safe template has arbitrary filesystem write access via directory symlinks when _preserve_symlinks: true

Impact 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 write to arbitrary directories outside the...

Copier safe template has arbitrary filesystem write access via directory symlinks when _preserve_symlinks: true

Impact 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 write to arbitrary directories outside the...

CVE-2026-23968

CVE-2026-23968 affects Copier (library and CLI) prior to version 9.11.2. The issue lets a safe-looking template include arbitrary files/directories outside the local template via symlinks when _preserve_symlinks is false, effectively enabling read access to sensitive data. Version 9.11.2 patches ...

CVE-2026-23968 Copier safe template has arbitrary filesystem read access via symlinks when _preserve_symlinks: false

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...

CVE-2026-23968 Copier safe template has arbitrary filesystem read access via symlinks when _preserve_symlinks: false

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...

CVE-2026-23968

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...

CVE-2026-23968 Copier safe template has arbitrary filesystem read access via symlinks when _preserve_symlinks: false

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...

EUVD-2026-4142

Copier safe template has arbitrary filesystem read access via symlinks when preservesymlinks: false...

UNIX Symbolic Link (Symlink) Following

Overview copier is an A library for rendering project templates. Affected versions of this package are vulnerable to UNIX Symbolic Link Symlink Following via the symlink resolution process in safe templates when preservesymlinks is set to false. An attacker can access arbitrary files or directori...

GHSA-XJHM-GP88-8PFX Copier safe template has arbitrary filesystem read access via symlinks when _preserve_symlinks: false

Impact 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 outsid...

Copier safe template has arbitrary filesystem read access via symlinks when _preserve_symlinks: false

Impact 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 outsid...

PT-2026-3871

Name of the Vulnerable Software and Affected Versions Copier versions prior to 9.11.2 Description Copier, a library and CLI app for rendering project templates, exhibited a flaw where it incorrectly identified templates as safe, even if they contained arbitrary files and directories outside the...

PT-2026-3872

Name of the Vulnerable Software and Affected Versions Copier versions prior to 9.11.2 Description Copier, a library and CLI app for rendering project templates, allows a malicious template author to overwrite arbitrary files. This occurs because a safe template can write to directories outside th...

CVE-2026-23986: UNIX Symbolic Link (Symlink) Following

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...

Copier security vulnerabilities

Copier is an open-source library used for rendering project templates by Copier. Versions of Copier prior to 9.11.2 contained a security vulnerability. This vulnerability stemmed from the use of symbolic links and certain settings, which could lead to writing into directories outside of the targe...