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Type: Build Failure
Resolution: Fixed
Priority: Unknown
Fix Version/s: 4.18.0
Affects Version/s: None
Component/s: None
Labels:
None

Confidence Status:
None

Assigned Teams:

Python Drivers

Documentation Changes:
Not Needed
Documentation Changes Summary:

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2. Would you like the user to see examples of the syntax and/or executable code and its output?
3. Which versions of the driver/connector does this apply to?

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1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

Aha! Reference:
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Tracking Level:
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Risk Status:
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Exec Notes:
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Goal Link:
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Goal Name(s):
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Name of Failure:

test.ocsp.test_ocsp.TestOCSP.test_tls

Link to task:

https://spruce.corp.mongodb.com/task/mongo_python_driver_ocsp_rhel8_test_ocsp_ecdsa_soft_fail_v8.0_python3.10_min_deps_00cfe6f16d262d9baca04677423287b479104e99_26_05_27_17_12_50/tests?execution=0&sorts=STATUS%3AASC

Context of when and why the failure occurred:

Started failing on May 21, 2026 when the pyopenssl version was bumped in this PR

Stack trace:

[2026/05/27 15:15:31.065] FAILURE: pymongo.errors.ServerSelectionTimeoutError: 'X509' object has no attribute 'get_extension', Timeout: 10.0s, Topology Description: <TopologyDescription id: 6a1750d346c0852e45860da3, topology_type: Unknown, servers: [<ServerDescription ('localhost', 27017) server_type: Unknown, rtt: None, error=AttributeError("'X509' object has no attribute 'get_extension'")>]> ()
[2026/05/27 15:15:31.065] self = <test_ocsp.TestOCSP testMethod=test_tls>
[2026/05/27 15:15:31.065]     def test_tls(self):
[2026/05/27 15:15:31.065]         options = "tls=true"
[2026/05/27 15:15:31.065]         if not OCSP_TLS_SHOULD_SUCCEED:
[2026/05/27 15:15:31.065]             self.assertRaisesRegex(
[2026/05/27 15:15:31.065]                 ServerSelectionTimeoutError, "invalid status response", _connect, options
[2026/05/27 15:15:31.065]             )
[2026/05/27 15:15:31.065]         else:
[2026/05/27 15:15:31.065] >           _connect(options)
[2026/05/27 15:15:31.065] test/ocsp/test_ocsp.py:72: 
[2026/05/27 15:15:31.065] _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
[2026/05/27 15:15:31.065] test/ocsp/test_ocsp.py:49: in _connect
[2026/05/27 15:15:31.065]     client.admin.command("ping")
[2026/05/27 15:15:31.065] pymongo/_csot.py:125: in csot_wrapper
[2026/05/27 15:15:31.065]     return func(self, *args, **kwargs)
[2026/05/27 15:15:31.065] pymongo/synchronous/database.py:953: in command
[2026/05/27 15:15:31.065]     return self._client._retryable_read(
[2026/05/27 15:15:31.065] pymongo/synchronous/mongo_client.py:2076: in _retryable_read
[2026/05/27 15:15:31.065]     return self._retry_internal(
[2026/05/27 15:15:31.065] pymongo/_csot.py:125: in csot_wrapper
[2026/05/27 15:15:31.065]     return func(self, *args, **kwargs)
[2026/05/27 15:15:31.065] pymongo/synchronous/mongo_client.py:2038: in _retry_internal
[2026/05/27 15:15:31.065]     ).run()
[2026/05/27 15:15:31.065] pymongo/synchronous/mongo_client.py:2811: in run
[2026/05/27 15:15:31.065]     res = self._read() if self._is_read else self._write()
[2026/05/27 15:15:31.065] pymongo/synchronous/mongo_client.py:3027: in _read
[2026/05/27 15:15:31.065]     self._server = self._get_server()
[2026/05/27 15:15:31.065] pymongo/synchronous/mongo_client.py:2975: in _get_server
[2026/05/27 15:15:31.065]     return self._client._select_server(
[2026/05/27 15:15:31.065] pymongo/synchronous/mongo_client.py:1851: in _select_server
[2026/05/27 15:15:31.065]     server = topology.select_server(
[2026/05/27 15:15:31.065] pymongo/synchronous/topology.py:428: in select_server
[2026/05/27 15:15:31.065]     server = self._select_server(
[2026/05/27 15:15:31.065] pymongo/synchronous/topology.py:402: in _select_server
[2026/05/27 15:15:31.065]     servers = self.select_servers(
[2026/05/27 15:15:31.065] pymongo/synchronous/topology.py:298: in select_servers
[2026/05/27 15:15:31.065]     server_descriptions = self._select_servers_loop(
[2026/05/27 15:15:31.065] _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
[2026/05/27 15:15:31.065] self = <Topology CLOSED <TopologyDescription id: 6a1750d346c0852e45860da3, topology_type: Unknown, servers: [<ServerDescription ('localhost', 27017) server_type: Unknown, rtt: None>]>>
[2026/05/27 15:15:31.065] selector = Primary(), timeout = 10.0, operation = 'ping', operation_id = None
[2026/05/27 15:15:31.065] address = None, deprioritized_servers = []
[2026/05/27 15:15:31.065]     def _select_servers_loop(
[2026/05/27 15:15:31.065]         self,
[2026/05/27 15:15:31.065]         selector: Callable[[Selection], Selection],
[2026/05/27 15:15:31.065]         timeout: float,
[2026/05/27 15:15:31.065]         operation: str,
[2026/05/27 15:15:31.065]         operation_id: Optional[int],
[2026/05/27 15:15:31.065]         address: Optional[_Address],
[2026/05/27 15:15:31.065]         deprioritized_servers: Optional[list[Server]] = None,
[2026/05/27 15:15:31.065]     ) -> list[ServerDescription]:
[2026/05/27 15:15:31.065]         """select_servers() guts. Hold the lock when calling this."""
[2026/05/27 15:15:31.065]         now = time.monotonic()
[2026/05/27 15:15:31.065]         end_time = now + timeout
[2026/05/27 15:15:31.065]         logged_waiting = False
[2026/05/27 15:15:31.065]     
[2026/05/27 15:15:31.065]         if _SERVER_SELECTION_LOGGER.isEnabledFor(logging.DEBUG):
[2026/05/27 15:15:31.065]             _debug_log(
[2026/05/27 15:15:31.065]                 _SERVER_SELECTION_LOGGER,
[2026/05/27 15:15:31.065]                 message=_ServerSelectionStatusMessage.STARTED,
[2026/05/27 15:15:31.065]                 selector=selector,
[2026/05/27 15:15:31.065]                 operation=operation,
[2026/05/27 15:15:31.065]                 operationId=operation_id,
[2026/05/27 15:15:31.065]                 topologyDescription=self.description,
[2026/05/27 15:15:31.065]                 clientId=self.description._topology_settings._topology_id,
[2026/05/27 15:15:31.065]             )
[2026/05/27 15:15:31.065]     
[2026/05/27 15:15:31.065]         server_descriptions = self._description.apply_selector(
[2026/05/27 15:15:31.065]             selector,
[2026/05/27 15:15:31.065]             address,
[2026/05/27 15:15:31.065]             custom_selector=self._settings.server_selector,
[2026/05/27 15:15:31.065]             deprioritized_servers=[server.description for server in deprioritized_servers]
[2026/05/27 15:15:31.065]             if deprioritized_servers
[2026/05/27 15:15:31.065]             else None,
[2026/05/27 15:15:31.065]         )
[2026/05/27 15:15:31.065]     
[2026/05/27 15:15:31.065]         while not server_descriptions:
[2026/05/27 15:15:31.065]             # No suitable servers.
[2026/05/27 15:15:31.065]             if timeout == 0 or now > end_time:
[2026/05/27 15:15:31.065]                 if _SERVER_SELECTION_LOGGER.isEnabledFor(logging.DEBUG):
[2026/05/27 15:15:31.065]                     _debug_log(
[2026/05/27 15:15:31.065]                         _SERVER_SELECTION_LOGGER,
[2026/05/27 15:15:31.065]                         message=_ServerSelectionStatusMessage.FAILED,
[2026/05/27 15:15:31.065]                         selector=selector,
[2026/05/27 15:15:31.065]                         operation=operation,
[2026/05/27 15:15:31.065]                         operationId=operation_id,
[2026/05/27 15:15:31.065]                         topologyDescription=self.description,
[2026/05/27 15:15:31.065]                         clientId=self.description._topology_settings._topology_id,
[2026/05/27 15:15:31.065]                         failure=self._error_message(selector),
[2026/05/27 15:15:31.065]                     )
[2026/05/27 15:15:31.065] >               raise ServerSelectionTimeoutError(
[2026/05/27 15:15:31.065]                     f"{self._error_message(selector)}, Timeout: {timeout}s, Topology Description: {self.description!r}"
[2026/05/27 15:15:31.065]                 )
[2026/05/27 15:15:31.065] E               pymongo.errors.ServerSelectionTimeoutError: 'X509' object has no attribute 'get_extension', Timeout: 10.0s, Topology Description: <TopologyDescription id: 6a1750d346c0852e45860da3, topology_type: Unknown, servers: [<ServerDescription ('localhost', 27017) server_type: Unknown, rtt: None, error=AttributeError("'X509' object has no attribute 'get_extension'")>]>
[2026/05/27 15:15:31.065] pymongo/synchronous/topology.py:359: ServerSelectionTimeoutError

Details

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Context of when and why the failure occurred:

Stack trace:

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