CVE-2026-114647 — NoSQL operator injection via unvalidated replacement document in findOneAndReplace
The MongoDB C# Driver does not reject replacement documents whose top-level field names begin with a dollar sign in FindOneAndReplace, unlike other replace operations. An applic…
Published: 2026-10-22 · CVSS: 5.3 · CVSS 4.0
The MongoDB C# Driver does not reject replacement documents whose top-level field names begin with a dollar sign in FindOneAndReplace, unlike other replace operations. An application that builds such a document from user-supplied field names can have the server apply update operators instead of a full replacement. The effect is limited to the document matched by the application's own filter, whose contents can be modified in ways the application did not intend.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7