diff --git a/pymongo/asynchronous/pool.py b/pymongo/asynchronous/pool.py
index 156da7b77..3cd7485a9 100644
--- a/pymongo/asynchronous/pool.py
+++ b/pymongo/asynchronous/pool.py
@@ -394,6 +394,29 @@ def _truncate_metadata(metadata: MutableMapping[str, Any]) -> None:
         metadata["platform"] = plat
     else:
         metadata.pop("platform", None)
+    encoded_size = len(bson.encode(metadata))
+    if encoded_size <= _MAX_METADATA_SIZE:
+        return
+    # 5. Truncate driver info.
+    overflow = encoded_size - _MAX_METADATA_SIZE
+    driver = metadata.get("driver", {})
+    if driver:
+        # Truncate driver version.
+        driver_version = driver.get("version")[:-overflow]
+        if len(driver_version) >= len(_METADATA["driver"]["version"]):
+            metadata["driver"]["version"] = driver_version
+        else:
+            metadata["driver"]["version"] = _METADATA["driver"]["version"]
+        encoded_size = len(bson.encode(metadata))
+        if encoded_size <= _MAX_METADATA_SIZE:
+            return
+        # Truncate driver name.
+        overflow = encoded_size - _MAX_METADATA_SIZE
+        driver_name = driver.get("name")[:-overflow]
+        if len(driver_name) >= len(_METADATA["driver"]["name"]):
+            metadata["driver"]["name"] = driver_name
+        else:
+            metadata["driver"]["name"] = _METADATA["driver"]["name"]
 
 
 # If the first getaddrinfo call of this interpreter's life is on a thread,
diff --git a/pymongo/synchronous/pool.py b/pymongo/synchronous/pool.py
index 3918116ba..b71cec220 100644
--- a/pymongo/synchronous/pool.py
+++ b/pymongo/synchronous/pool.py
@@ -394,6 +394,29 @@ def _truncate_metadata(metadata: MutableMapping[str, Any]) -> None:
         metadata["platform"] = plat
     else:
         metadata.pop("platform", None)
+    encoded_size = len(bson.encode(metadata))
+    if encoded_size <= _MAX_METADATA_SIZE:
+        return
+    # 5. Truncate driver info.
+    overflow = encoded_size - _MAX_METADATA_SIZE
+    driver = metadata.get("driver", {})
+    if driver:
+        # Truncate driver version.
+        driver_version = driver.get("version")[:-overflow]
+        if len(driver_version) >= len(_METADATA["driver"]["version"]):
+            metadata["driver"]["version"] = driver_version
+        else:
+            metadata["driver"]["version"] = _METADATA["driver"]["version"]
+        encoded_size = len(bson.encode(metadata))
+        if encoded_size <= _MAX_METADATA_SIZE:
+            return
+        # Truncate driver name.
+        overflow = encoded_size - _MAX_METADATA_SIZE
+        driver_name = driver.get("name")[:-overflow]
+        if len(driver_name) >= len(_METADATA["driver"]["name"]):
+            metadata["driver"]["name"] = driver_name
+        else:
+            metadata["driver"]["name"] = _METADATA["driver"]["name"]
 
 
 # If the first getaddrinfo call of this interpreter's life is on a thread,
diff --git a/test/test_client.py b/test/test_client.py
index 64b1addbb..503c2e6e3 100644
--- a/test/test_client.py
+++ b/test/test_client.py
@@ -72,6 +72,7 @@ from test.utils import (
     wait_until,
 )
 
+import bson
 import pymongo
 from bson import encode
 from bson.codec_options import (
@@ -106,6 +107,7 @@ from pymongo.synchronous.database import Database
 from pymongo.synchronous.mongo_client import MongoClient
 from pymongo.synchronous.monitoring import ServerHeartbeatListener, ServerHeartbeatStartedEvent
 from pymongo.synchronous.pool import (
+    _MAX_METADATA_SIZE,
     _METADATA,
     ENV_VAR_K8S,
     Connection,
@@ -361,6 +363,25 @@ class ClientUnitTest(unittest.TestCase):
         )
         options = client.options
         self.assertEqual(options.pool_options.metadata, metadata)
+        # Test truncating driver info metadata.
+        client = MongoClient(
+            driver=DriverInfo(name="s" * _MAX_METADATA_SIZE),
+            connect=False,
+        )
+        options = client.options
+        self.assertLessEqual(
+            len(bson.encode(options.pool_options.metadata)),
+            _MAX_METADATA_SIZE,
+        )
+        client = MongoClient(
+            driver=DriverInfo(name="s" * _MAX_METADATA_SIZE, version="s" * _MAX_METADATA_SIZE),
+            connect=False,
+        )
+        options = client.options
+        self.assertLessEqual(
+            len(bson.encode(options.pool_options.metadata)),
+            _MAX_METADATA_SIZE,
+        )
 
     @mock.patch.dict("os.environ", {ENV_VAR_K8S: "1"})
     def test_container_metadata(self):