CVE-2026-44966CWE-1321

Velocity.js: Prototype Pollution in #set path assignment

High · published May 26, 2026

CVSS v3.1
8.3
EPSS
1%
Percentile
48.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00606 · 48.3th percentile
Weakness
CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Published
2026-05-26T21:21Z
EPSS history
Timeline
  • 26 MAY 21:21Z
    Velocity.js: Prototype Pollution in #set path assignment
    cvelistv5