CVE-2026-73649: Shepherdwind Velocity.js

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

Velocity.js is a JavaScript implementation of the Apache Velocity template engine. Prior to 2.1.7, the earlier fix for CVE-2026-44966 filtered constructor, __proto__, and prototype only in the #set assignment handler in src/compile/set.ts, while property-read expressions in src/compile/references.ts remained unfiltered. The getReferences() flow called getAttributes(), whose property access allowed an attacker-controlled template to traverse constructor.constructor to the JavaScript Function constructor. The #set handler validated only the assignment target and did not inspect the right-hand property-read expression, allowing arbitrary shell commands, environment-variable access, cloud-credential access, and internal-network access in the server process. This issue is fixed in version 2.1.7.

Affected products

• Shepherdwind Velocity.js: before 2.1.7 (fixed in 2.1.7)

Published 2026-08-13. Last modified 2026-09-18.