CVE-2026-73649

CVE-2026-73649 · Velocity.js: Remote Code Execution via property-read to Function constructor (bypass of CVE-2026-44966 fix)

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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.

CVSS 9.8 · Critical · EPSS 0.7% · Fix available

Published

2026-08-13T18:05:31.929Z

Updated

2026-08-14T16:42:31.371Z

Stack: node

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