Twig security release: Possibility to load a template outside a configured directory when using the filesystem loader

Affected versions

Twig >1.0.0,<1.44.7 || >2.0.0,<2.15.3 || >3.0.0,<3.4.3 are affected by this security issue.

The issue has been fixed in Twig 1.44.7, 2.15.3 and 3.4.3.


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).


We fixed validation for such template names.

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


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

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