CVE-2021-32819: Squirrelly

High severity, CVSS 8.8. EPSS: 58.3% chance of exploitation in the next 30 days.

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.

Affected products

• Squirrelly Squirrelly: version 8.0.8 only

Published 2021-05-14. Last modified 2026-06-17.