CVE-2026-44966
High
Description
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.
SeverityHigh
CVSS8.3
Exploit probability—
ProductShepherdwind Velocity.js
PublishedMay 26, 2026
First seenMay 26, 2026
Weakness typeCWE-1321Prototype pollution
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| shepherdwind velocity.js | v ≤ 2.1.5 | — |
| velocityjsnpm | v ≤ 2.1.5 | — |
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