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CVE-2026-85625

sift 17.1.3 Prototype Pollution Remote Code Execution via $where

CVSS 4.0 9.2 CRITICALCVSS 3.1 8.1 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-85625

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-85625

Published

sift.js

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "crcn",
                    "product": "sift.js",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:npm/sift",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThanOrEqual": "17.1.3"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON