CVE-2026-81527 NoSQL injection via unquoted constant GroupBy keys in LINQ pipeline translation

A NoSQL/expression injection weakness exists in the LINQ-to-aggregation query translation layer of the MongoDB C Driver, in both aggregation expression and query filter translation. When application-supplied values are embedded in certain query constructs, special elements contained within those...

CVE-2026-81527

CVE-2026-81527 is a NoSQL/expression injection flaw in the MongoDB C# Driver , specifically in the LINQ-to-aggregation query translation layer affecting both aggregation expression and query filter translation. The root cause is that unquoted constant GroupBy keys in LINQ pipeline translation are...