CVE-2021-44657: Stackstorm

High severity, CVSS 8.8. EPSS: 2.6% chance of exploitation in the next 30 days.

In StackStorm versions prior to 3.6.0, the jinja interpreter was not run in sandbox mode and thus allows execution of unsafe system commands. Jinja does not enable sandboxed mode by default due to backwards compatibility. Stackstorm now sets sandboxed mode for jinja by default.

Affected products

• Stackstorm Stackstorm: before 3.6.0 (fixed in 3.6.0)

Published 2021-12-15. Last modified 2026-06-17.