Twig may load a template outside a configured directory when using the filesystem loader

Summary

Twig is a template language for PHP. Versions 1.x prior to 1.44.7, 2.x prior to 2.15.3, and 3.x prior to 3.4.3 encounter an issue when the filesystem loader loads templates for which the name is a user input. It is possible to use the `source` or `include` statement to read arbitrary files from outside the templates' directory when using a namespace like `@somewhere/../some.file`. In such a case, validation is bypassed. Versions 1.44.7, 2.15.3, and 3.4.3 contain a fix for validation of such template names. There are no known workarounds aside from upgrading.

Timeline

1. Sep 28, 2022, 12:00 AM UTCCVE published
2. Apr 23, 2025, 3:50 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: yes · Technical impact: partial

3. Apr 23, 2025, 4:54 PM UTCRecord last updated

Affected versions

• twigphp Twig

  From 2.0.0 · fixed in 2.15.3; From 3.0.0 · fixed in 3.4.3

• drupal/corePackagist

  From 8.0.0 · fixed in 9.3.22; From 9.4.0 · fixed in 9.4.7

• twig/twigPackagist

  From 1.0.0 · fixed in 1.44.7

• twig/twigPackagist

  From 2.0.0 · fixed in 2.15.3

• twig/twigPackagist

  From 3.0.0 · fixed in 3.4.3

References 11