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

Quick assessment

Affected
shepherdwind velocity.js
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Velocity.js是Eward个人开发者的一个JavaScript实现的Apache Velocity模板引擎。 Velocity.js 2.1.5及之前版本存在安全漏洞，该漏洞源于处理#set指令时存在原型污染，攻击者可通过控制模板修改Object.prototype，可能导致拒绝服务或远程代码执行。

CVSS 8.3 · High EPSS 0.61% · P48

Affected Version Matrix 1

VendorProduct Version RangeStatus
shepherdwind velocity.js <= 2.1.5 affected
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I. Basic Information for CVE-2026-44966

Vulnerability Information
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Vulnerability Title
Velocity.js: Prototype Pollution in #set path assignment
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Velocity.js 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Velocity.js是Eward个人开发者的一个JavaScript实现的Apache Velocity模板引擎。 Velocity.js 2.1.5及之前版本存在安全漏洞，该漏洞源于处理#set指令时存在原型污染，攻击者可通过控制模板修改Object.prototype，可能导致拒绝服务或远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
shepherdwind velocity.js <= 2.1.5 -

II. Public POCs for CVE-2026-44966

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8066 chars
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Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-44966

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Other References for CVE-2026-44966 (1)

IV. Related Vulnerabilities

Same product: velocity.js
Same vendor: shepherdwind
Same weakness: CWE-1321

V. Comments for CVE-2026-44966

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