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

HIGH 7.5CVE-2022-39261 · BIT-drupal-2022-39261 · DRUPAL-CORE-2022-016 · Published 28/09/2022 · updated 17/06/2026

In short

CVE-2022-39261 is a HIGH (CVSS 7.5) vulnerability affecting drupal/core, twig/twig, drupal (drupal).
Chance of exploitation in the next 30 days (EPSS): 3.2%, higher than 88.0% of all vulnerabilities.
Fix: update to 9.3.22, 9.4.7, 1.44.7, 2.15.3 or later.

Package	Affected versions	Patched versions
drupal/core Packagist	`≥ 8.0.0, < 9.3.22≥ 9.4.0, < 9.4.7`	`9.3.229.4.7`
twig/twig Packagist	`≥ 1.0.0, < 1.44.7≥ 2.0.0, < 2.15.3≥ 3.0.0, < 3.4.3`	`1.44.72.15.33.4.3`
drupal drupal	`≥ 8.0.0, < 9.3.22≥ 9.4.0, < 9.4.7`	`9.3.229.4.7`
twig symfony	`≥ 1.0.0, < 1.44.7≥ 2.0.0, < 2.15.3≥ 3.0.0, < 3.4.3`	`1.44.72.15.33.4.3`

Description

When using the filesystem loader to load 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).

Resolution

We fixed validation for such template names.

Even if the 1.x branch is not maintained anymore, a new version has been released.

Credits

We would like to thank Dariusz Tytko for reporting the issue and Fabien Potencier for fixing the issue.

NVD description

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.