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CVE-2026-85625— sift 17.1.3 Prototype Pollution Remote Code Execution via $where

Quick assessment

Affected
crcn sift.js
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

sift（sift.js）17.1.3 版本使用 遍历查询键。 会遍历对象的整个原型链，因此会检测到匹配的操作符键（包括 ）。 操作会将字符串值通过 编译为函数——除非设置了 （该配置默认未设置）。因此，如果进程中其他地方存在一个原型污染原语，将 设置为恶意字符串，那么即使是看似无害的过滤调用，如 ，也会执行任意 JavaScript 代码。此外，在默认配置下，将一个包含字符串 的不可信查询对象直接传给 ，也会导致代码执行。

CVSS 8.1 · High

Possible ATT&CK Techniques 1 AI

T1203.002

Affected Version Matrix 1

VendorProduct Version RangeStatus
crcn sift.js ≤ 17.1.3 affected
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I. Basic Information for CVE-2026-85625

Vulnerability Information
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Vulnerability Title
sift 17.1.3 Prototype Pollution Remote Code Execution via $where
Source: CVE Program / CVE List V5
Vulnerability Description
sift (sift.js) 17.1.3 enumerates query keys with for...in, which walks the object prototype chain, and dispatches any matched operator key including $where. The $where operation compiles a string value into a function using new Function unless CSP_ENABLED is set (not set by default). As a result, if a prototype-pollution primitive elsewhere in the process sets Object.prototype.$where to a malicious string, even benign filter calls such as sift({}) execute arbitrary JavaScript. Additionally, passing an untrusted query object containing a string $where directly to sift results in code execution under the default configuration.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
crcn sift.js 0 ~ 17.1.3 -

II. Public POCs for CVE-2026-85625

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III. Intelligence Information for CVE-2026-85625

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Vendor Advisories for CVE-2026-85625 (1)

Proof of Concept for CVE-2026-85625 (2)

IV. Related Vulnerabilities

Same weakness: CWE-1321

V. Comments for CVE-2026-85625

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