CVE-2026-44966 HIGH

CVE-2026-44966: Velocity.js: Prototype Pollution in #set path assignment

Vendor Shepherdwind
Product velocity.js
Weakness CWE-1321
Published May 26, 2026
Last update June 1, 2026

CVSS base score

8.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

What the vulnerability does

01Description

Velocity.js is a JavaScript implementation of the Apache Velocity template engine. In 2.1.5 and earlier, a prototype pollution vulnerability was discovered in velocityjs. This issue occurs during the processing of #set directives in Velocity templates. If an application renders a template controlled by an attacker, it is possible to modify Object.prototype, potentially leading to Denial of Service (DoS) or Remote Code Execution (RCE) depending on the server environment.

Key dates

02Disclosure timeline

May 26, 2026 CVE published
June 1, 2026 Record updated