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CVE-2026-73649— Velocity.js: Remote Code Execution via property-read to Function constructor (bypass of CVE-2026-44966 fix)

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 Apache Velocity 模板引擎的 JavaScript 实现。在 2.1.7 版本之前，针对 CVE-2026-44966 的先前修复仅过滤了 中 赋值处理程序里的 、 和 ，而 中的属性读取表达式仍未进行过滤。 流程调用了 ，其属性访问允许攻击者控制的模板通过 链式访问 JavaScript 的 构造函数。 处理程序仅验证了赋值的目标（左操作数），而未检查右侧的属性读取表达式，从而导致攻击者可以在服务器进程中执行任意 shell 命令、访问环境变量、获取云凭证以及探测内部网络

CVSS 9.8 · Critical EPSS 0.73% · P54

Affected Version Matrix 1

VendorProduct Version RangeStatus
shepherdwind velocity.js < 2.1.7 affected
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I. Basic Information for CVE-2026-73649

Vulnerability Information
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Vulnerability Title
Velocity.js: Remote Code Execution via property-read to Function constructor (bypass of CVE-2026-44966 fix)
Source: CVE Program / CVE List V5
Vulnerability Description
Velocity.js is a JavaScript implementation of the Apache Velocity template engine. Prior to 2.1.7, the earlier fix for CVE-2026-44966 filtered constructor, __proto__, and prototype only in the #set assignment handler in src/compile/set.ts, while property-read expressions in src/compile/references.ts remained unfiltered. The getReferences() flow called getAttributes(), whose property access allowed an attacker-controlled template to traverse constructor.constructor to the JavaScript Function constructor. The #set handler validated only the assignment target and did not inspect the right-hand property-read expression, allowing arbitrary shell commands, environment-variable access, cloud-credential access, and internal-network access in the server process. This issue is fixed in version 2.1.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
shepherdwind velocity.js < 2.1.7 -

II. Public POCs for CVE-2026-73649

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7000 chars
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III. Intelligence Information for CVE-2026-73649

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Patches & Fixes for CVE-2026-73649 (2)

Vendor Pages for CVE-2026-73649 (1)

Other References for CVE-2026-73649 (1)

IV. Related Vulnerabilities

Same product: velocity.js
Same vendor: shepherdwind
Same weakness: CWE-94

V. Comments for CVE-2026-73649

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