CVE-2026-81528 — NoSQL injection via array replacement bypassing update shape validation in driver write path
A MongoDB C# driver document-replacement code path omits the element-name/shape validation that the equivalent write paths apply, so a value supplied as a replacement is forward…
Published: 2026-08-27 · CVSS: 5.3 · CVSS 4.0
A MongoDB C# driver document-replacement code path omits the element-name/shape validation that the equivalent write paths apply, so a value supplied as a replacement is forwarded to the server without neutralization of query-language special elements. An application that passes untrusted, loosely-typed input as a replacement value therefore allows that input to be interpreted by the database as update logic rather than as data, executing under the application's own database credentials. Applications using strongly-typed document mappings are not affected.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7