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CVE-2026-81528 is a NoSQL injection vulnerability in the MongoDB C# Driver document-replacement path. This path omits the element-name and document-shape validation applied by equivalent write operations. Consequently, an untrusted, loosely typed value supplied as a replacement document can retain MongoDB query-language special elements and be interpreted by the server as update logic rather than inert document data. MongoDB C# Driver versions 2.10.0 through 3.11.0 are affected. Applications using strongly typed document mappings are not affected.
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A MongoDB C# Driver NoSQL-injection flaw caused by insufficient validation of document-replacement update shapes.
An injection flaw in the MongoDB C# driver document-replacement path. Insufficient validation permits query-language special elements in untrusted, loosely typed replacement input to be processed as MongoDB update logic. Strongly typed document mappings are not affected.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.