In MongoDB, insufficient validation of shard key values during document insertion allowed authenticated users to store documents with specially crafted, operator-shaped objects as shard key values in sharded collections. When change stream events for such documents were processed with the updateLookup full document mode, the crafted values were embedded into internal post-image lookup queries without proper sanitization, causing them to be interpreted as query operators rather than literal equality values. This could result in change stream consumers receiving incorrect post-image documents or encountering non-resumable fatal errors.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Mongodb | — | Upgrade MongoDB to version 8.0.30Upgrade MongoDB to version 8.3.9Upgrade MongoDB to version 7.0.41Upgrade to the latest version of MongoDB | Sep 23, 2026 | Sep 8, 2026 |
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