Sourced from pymongo's releases.

PyMongo 4.12.1

Community notes: https://www.mongodb.com/community/forums/t/pymongo-4-12-1-released/320326

What's Changed

• PYTHON-5288: [v4.12] SRV hostname validation fails when resolver and resolved hostnames are identical with three domain levels by @​blink1073 in mongodb/mongo-python-driver#2276
• PYTHON-5297 [v4.12] AsyncMongoClient connection error causes UnboundLocalError by @​blink1073 in mongodb/mongo-python-driver#2277
• PYTHON-5295 [v4.12] Update lockfile for compat with older versions of uv by @​blink1073 in mongodb/mongo-python-driver#2278
• PYTHON-5310 [v4.12] Fix uri_parser AttributeError when used directly (#2283) by @​ShaneHarvey in mongodb/mongo-python-driver#2302
• PYTHON-5314 [v4.12] Fix default imports for modules that worked in v4.8 (#2300) by @​ShaneHarvey in mongodb/mongo-python-driver#2303
• PYTHON-5348 Fix CodeQL Scanning for GitHub Actions (#2308) [v4.12] by @​mongodb-drivers-pr-bot in mongodb/mongo-python-driver#2310
• PYTHON-5212 [v4.12] Do not hold Topology lock while resetting pool by @​blink1073 in mongodb/mongo-python-driver#2307
• PYTHON-5346: [v4.12] test_init_disconnected_with_srv cannot run against sharded Topologies (#2304) by @​NoahStapp in mongodb/mongo-python-driver#2309
• PYTHON-5306: [v4.12] - Fix use of public MongoClient attributes before connection (#2285) by @​NoahStapp in mongodb/mongo-python-driver#2311
• PYTHON-5336 Added VECTOR_SUBTYPE line to API docs (#2313) [v4.12] by @​mongodb-drivers-pr-bot in mongodb/mongo-python-driver#2314
• PYTHON-5309: [v4.12] AsyncMongoClient doesn't use PyOpenSSL (#2286) by @​NoahStapp in mongodb/mongo-python-driver#2319
• PYTHON-5357 Update changelog for 4.12.1 release (#2321) by @​aclark4life in mongodb/mongo-python-driver#2323

Full Changelog: https://github.com/mongodb/mongo-python-driver/compare/4.12.0...4.12.1

PyMongo 4.12.0

Community notes: https://www.mongodb.com/community/forums/t/pymongo-4-12-released/318187

Sourced from pymongo's changelog.

Changes in Version 4.12.1 (2025/04/29)

Version 4.12.1 is a bug fix release.

• Fixed a bug that could raise UnboundLocalError when creating asynchronous connections over SSL.
• Fixed a bug causing SRV hostname validation to fail when resolver and resolved hostnames are identical with three domain levels.
• Fixed a bug that caused direct use of pymongo.uri_parser to raise an AttributeError.
• Fixed a bug where clients created with connect=False and a "mongodb+srv://" connection string could cause public pymongo.MongoClient and pymongo.AsyncMongoClient attributes (topology_description, nodes, address, primary, secondaries, arbiters) to incorrectly return a Database, leading to type errors such as: "NotImplementedError: Database objects do not implement truth value testing or bool()".
• Removed Eventlet testing against Python versions newer than 3.9 since Eventlet is actively being sunset by its maintainers and has compatibility issues with PyMongo's dnspython dependency.
• Fixed a bug where MongoDB cluster topology changes could cause asynchronous operations to take much longer to complete due to holding the Topology lock while closing stale connections.
• Fixed a bug that would cause AsyncMongoClient to attempt to use PyOpenSSL when available, resulting in errors such as "pymongo.errors.ServerSelectionTimeoutError: 'SSLContext' object has no attribute 'wrap_bio'".

Issues Resolved ...............

See the PyMongo 4.12.1 release notes in JIRA_ for the list of resolved issues in this release.

.. _PyMongo 4.12.1 release notes in JIRA: https://jira.mongodb.org/secure/ReleaseNote.jspa?projectId=10004&version=43094

Changes in Version 4.12.0 (2025/04/08)

.. warning:: Driver support for MongoDB 4.0 reached end of life in April 2025. PyMongo 4.12 will be the last release to support MongoDB 4.0.

PyMongo 4.12 brings a number of changes including:

• Support for configuring DEK cache lifetime via the key_expiration_ms argument to :class:~pymongo.encryption_options.AutoEncryptionOpts.
• Support for $lookup in CSFLE and QE supported on MongoDB 8.1+.
• pymongocrypt>=1.13 is now required for :ref:In-Use Encryption support.
• Added :meth:gridfs.asynchronous.grid_file.AsyncGridFSBucket.rename_by_name and :meth:gridfs.grid_file.GridFSBucket.rename_by_name for more performant renaming of a file with multiple revisions.
• Added :meth:gridfs.asynchronous.grid_file.AsyncGridFSBucket.delete_by_name and :meth:gridfs.grid_file.GridFSBucket.delete_by_name for more performant deletion of a file with multiple revisions.
• AsyncMongoClient no longer performs DNS resolution for "mongodb+srv://" connection strings on creation. To avoid blocking the asyncio loop, the resolution is now deferred until the client is first connected.
• Added index hinting support to the :meth:~pymongo.asynchronous.collection.AsyncCollection.distinct and :meth:~pymongo.collection.Collection.distinct commands.
• Deprecated the hedge parameter for :class:~pymongo.read_preferences.PrimaryPreferred,

... (truncated)

• 84d0d3d BUMP 4.12.1
• c52a456 PYTHON-5357 Update changelog for 4.12.1 release (#2321) (#2323)
• dd99f80 PYTHON-5309: [v4.12] AsyncMongoClient doesn't use PyOpenSSL (#2286) (#2319)
• fecd29c PYTHON-5336 Added VECTOR_SUBTYPE line to API docs (#2313) [v4.12] (#2314)
• c11d0f4 PYTHON-5306: [v4.12] - Fix use of public MongoClient attributes before connec...
• f5836b3 PYTHON-5346: [v4.12] test_init_disconnected_with_srv cannot run against shard...
• 38bc13d PYTHON-5212 [v4.12] Do not hold Topology lock while resetting pool (#2307)
• c6671e2 PYTHON-5348 Fix CodeQL Scanning for GitHub Actions (#2308) [v4.12] (#2310)
• 79cb34a PYTHON-5314 [v4.12] Fix default imports for modules that worked in v4.8 (#230...
• c837846 PYTHON-5310 [v4.12] Fix uri_parser AttributeError when used directly (#2283) ...
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