CVE-2026-44966

Velocity.js: Prototype Pollution in #set path assignment

Published May 26, 2026 CVSS 3.1 · 8.3 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-j658-c2gf-x6pq Velocity.js has a Prototype Pollution vulnerability through #set path assignment
History
Type Values Removed Values Added
CPEs cpe:2.3:a:shepherdwind:velocity.js:*:*:*:*:*:node.js:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Shepherdwind
Shepherdwind velocity.js
Vendors & Products Shepherdwind
Shepherdwind velocity.js
Type Values Removed Values Added
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.
Title Velocity.js: Prototype Pollution in #set path assignment
Weaknesses CWE-1321
References
Metrics cvssV3_1

{'score': 8.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 1, 2026, 5:08 PM
Reserved
May 8, 2026, 4:23 PM
Status
Analyzed
Published
May 26, 2026, 10:16 PM
Modified
Jul 24, 2026, 12:10 PM