CVE-2026-85625

Summary

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.

Affected Software

Weaknesses

• CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

References

• https://github.com/crcn/sift.js/issues/276
• https://github.com/crcn/sift.js
• https://github.com/crcn/sift.js/blob/v17.1.3/src/core.ts
• https://www.vulncheck.com/advisories/sift-17.1.3-prototype-pollution-remote-code-execution-via-where

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