---
id: CVE-2026-73649
title: >-
  Velocity.js is a JavaScript implementation of the Apache Velocity template
  engine
summary: >-
  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.t…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-94
published: '2026-08-13'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73649'
references:
  - url: >-
      https://github.com/shepherdwind/velocity.js/commit/f8e47a6c4607249b9c967d3a1ced959b4dd64dba
    label: security-advisories@github.com
  - url: 'https://github.com/shepherdwind/velocity.js/pull/192'
    label: security-advisories@github.com
  - url: 'https://github.com/shepherdwind/velocity.js/releases/tag/v2.1.7'
    label: security-advisories@github.com
  - url: >-
      https://github.com/shepherdwind/velocity.js/security/advisories/GHSA-7gfh-x38p-prh3
    label: security-advisories@github.com
  - url: >-
      https://github.com/shepherdwind/velocity.js/security/advisories/GHSA-7gfh-x38p-prh3
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00726
epssPercentile: 0.52063
ingestedAt: '2026-09-18T20:51:25.609Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.