Remote code execution in squirrelly

Squirrelly is a template engine implemented in JavaScript that works out of the box with ExpressJS. Squirrelly mixes pure template data with engine configuration options through the Express render API. By overwriting internal configuration options remote code execution may be triggered in downstream applications. This issue is fixed in version 9.0.0. For complete details refer to the referenced GHSL-2021-023.

squirrellyjs squirrelly v9.0.0 and fixed in v.9.0.1 was discovered to contain a code injection vulnerability via the component options.varName.