CVE-2026-73649
CriticalCVSS 9.8Summary
Velocity.js before 2.1.7 does not filter property-read expressions in src/compile/references.ts, allowing access to the Function constructor via constructor.constructor. Although the #set handler validates the assignment target, it does not inspect the right-hand property-read expression, enabling 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.
Risk Assessment
An attacker could execute arbitrary code on the server, access sensitive data (environment variables, credentials), and perform attacks on the internal network, potentially leading to full system compromise.
Recommendation
Update Velocity.js to version 2.1.7 or later and restrict trust in templates from untrusted sources.
Original NVD description (English source)
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.