CVE-2026-85625sift 17.1.3 Prototype Pollution Remote Code Execution via $where
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-1321
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
crcn sift.js crcn:sift.js (from the name) | through 17.1.3 | CNA record |
References
- https://github.com/crcn/sift.js/issues/276issue-tracking
- https://github.com/crcn/sift.jsproduct
- https://github.com/crcn/sift.js/blob/v17.1.3/src/core.tstechnical-description
- https://www.vulncheck.com/advisories/sift-17.1.3-prototype-pollution-remote-code-execution-via-wherethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.