Release Notes - C++ Driver - Version 3.8.0

What's New

Support MongoDB server version 6.0 and 7.0
Support C++20 language standard
Support updated Queryable Encryption protocol
- Introduces backwards breaking changes to the Queryable Encryption protocol. Using Queryable Encryption now requires MongoDB server version 7.0+.
Support new Queryable Encryption features
- Add client_encryption::create_encrypted_collection to automatically create data encryption keys when creating a new encrypted collection.
Support new security features
- Add ability to fetch KMS credentials automatically from Azure, GCP, and AWS environments.
- Support authentication with KMS AWS temporary credentials.
- Cache fetched AWS credentials.
- Support AWS IAM Roles for service accounts, EKS in particular.
Add srvMaxHosts option to limit the number of mongos servers used in connecting to sharded clusters.
Retry operations if the connection handshake fails.

Support for below operating systems will be dropped in an upcoming release.

[CXX-2451] - Kerberos on Windows should not pass username to SSPI when password is not set
[CXX-2548] - Disable causal consistency in implicit sessions
[CXX-2599] - Error if RewrapManyDataKey is called with masterKey and without provider
[CXX-2670] - options::aggregate::append ignores readConcern

[CXX-2307] - Add native support for AWS IAM Roles for service accounts, EKS in particular
[CXX-2318] - Provide options to limit number of mongos servers used in connecting to sharded clusters
[CXX-2425] - Key Management API
[CXX-2474] - Add ClientEncryption entity and Key Management API operations to Unified Test Format
[CXX-2496] - Add Queryable Encryption behavior for CreateCollection() and Collection.Drop()
[CXX-2500] - Add Queryable Encryption API to AutoEncryptionOpts
[CXX-2502] - Add Queryable Encryption API to ClientEncryptionOpts
[CXX-2508] - Obtain AWS credentials for CSFLE in the same way as for MONGODB-AWS
[CXX-2546] - Automatically create Queryable Encryption keys
[CXX-2554] - Cache AWS Credentials Where Possible

[CXX-1712] - Overload bsoncxx::to_json to accept a bsoncxx::array::view
[CXX-2172] - Support AWS authentication with temporary credentials in CSFLE
[CXX-2284] - Append platform data to handshake
[CXX-2344] - Use OP_MSG to authenticate if server supports OP_MSG
[CXX-2393] - Drivers should retry operations if connection handshake fails
[CXX-2394] - Require hello command for connection handshake to use OP_MSG, disallowing OP_QUERY
[CXX-2433] - Support In-Use Encryption Shared Library
[CXX-2441] - Add example of iterating change stream indefinitely
[CXX-2490] - Make allowDiskUse opt-out rather than opt-in in 6.0
[CXX-2491] - Clustered Indexes for all Collections
[CXX-2517] - Support for Range Indexes
[CXX-2527] - Reduce expected removeKeyAltName operations to a single findOneAndUpdate
[CXX-2528] - Ensure "does not fail" in CSE Prose Test 13 accounts for (no) matching documents
[CXX-2534] - Allow RewrapManyDataKeyResult.bulkWriteResult to be optional
[CXX-2551] - Add support for GCP attached service accounts when using GCP KMS
[CXX-2562] - Error if RewrapManyDataKey is called with libmongocrypt < 1.5.2
[CXX-2565] - Support the Azure VM-assigned Managed Identity for Automatic KMS Credentials
[CXX-2610] - Improve test coverage for retryable handshake errors
[CXX-2637] - Deprecate currentOp/collStats commands by 7.0
[CXX-2642] - Drivers should not create the ECC collection in v2 of queryable encryption
[CXX-2664] - Bump maxWireVersion for MongoDB 7.0

Think you’ve found a bug? Want to see a new feature in the C++ Driver? Please open a case in our issue management tool, Jira:

Create an account and login.
Navigate to the CXX project.
Click Create Issue. Please provide as much information as possible about the issue type and how to reproduce it.
Bug reports in Jira for all driver projects (i.e. CXX, CDRIVER etc) and the Core Server (i.e. SERVER) projects are public.