Memory leak due to connection not authenticating, exhausting connection pool #15785
Description
Prerequisites
- I have written a descriptive issue title
- I have searched existing issues to ensure the bug has not already been reported
Mongoose version
v9.0.0
Node.js version
v22.17.1
MongoDB server version
8.0.16
Typescript version (if applicable)
Latest
Description
Mongoose generates a lot of connection-related messages in mongodb log file, and spiking RAM usage:
{"t":{"$date":"2025-11-22T14:42:56.745+00:00"},"s":"I", "c":"ACCESS", "id":10483900,"ctx":"conn400","msg":"Connection not authenticating","attr":{"client":"127.0.0.1:39710","doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:42:56.817+00:00"},"s":"I", "c":"NETWORK", "id":22943, "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:39726","isLoadBalanced":false,"uuid":{"uuid":{"$uuid":"8a045039-0b94-43f1-86ff-746b2bd4418d"}},"connectionId":401,"connectionCount":170}}
{"t":{"$date":"2025-11-22T14:42:56.820+00:00"},"s":"I", "c":"NETWORK", "id":51800, "ctx":"conn401","msg":"client metadata","attr":{"remote":"127.0.0.1:39726","client":"conn401","negotiatedCompressors":[],"doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:42:56.820+00:00"},"s":"I", "c":"ACCESS", "id":10483900,"ctx":"conn401","msg":"Connection not authenticating","attr":{"client":"127.0.0.1:39726","doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:42:58.105+00:00"},"s":"I", "c":"NETWORK", "id":22943, "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:39730","isLoadBalanced":false,"uuid":{"uuid":{"$uuid":"a59a4994-78de-4625-afc0-2f11f8b74cdd"}},"connectionId":402,"connectionCount":171}}
{"t":{"$date":"2025-11-22T14:42:58.105+00:00"},"s":"I", "c":"NETWORK", "id":51800, "ctx":"conn402","msg":"client metadata","attr":{"remote":"127.0.0.1:39730","client":"conn402","negotiatedCompressors":[],"doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:42:58.105+00:00"},"s":"I", "c":"ACCESS", "id":10483900,"ctx":"conn402","msg":"Connection not authenticating","attr":{"client":"127.0.0.1:39730","doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:42:58.236+00:00"},"s":"I", "c":"NETWORK", "id":22943, "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:39738","isLoadBalanced":false,"uuid":{"uuid":{"$uuid":"55627a9b-8ca8-49b2-9c79-a5e3ea7db85d"}},"connectionId":403,"connectionCount":172}}
{"t":{"$date":"2025-11-22T14:42:58.236+00:00"},"s":"I", "c":"NETWORK", "id":51800, "ctx":"conn403","msg":"client metadata","attr":{"remote":"127.0.0.1:39738","client":"conn403","negotiatedCompressors":[],"doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:42:58.236+00:00"},"s":"I", "c":"ACCESS", "id":10483900,"ctx":"conn403","msg":"Connection not authenticating","attr":{"client":"127.0.0.1:39738","doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:42:59.667+00:00"},"s":"I", "c":"NETWORK", "id":22943, "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:39746","isLoadBalanced":false,"uuid":{"uuid":{"$uuid":"d9a71a2d-d9bd-450b-95dd-1940914d2f60"}},"connectionId":404,"connectionCount":173}}
{"t":{"$date":"2025-11-22T14:42:59.667+00:00"},"s":"I", "c":"NETWORK", "id":51800, "ctx":"conn404","msg":"client metadata","attr":{"remote":"127.0.0.1:39746","client":"conn404","negotiatedCompressors":[],"doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:42:59.667+00:00"},"s":"I", "c":"ACCESS", "id":10483900,"ctx":"conn404","msg":"Connection not authenticating","attr":{"client":"127.0.0.1:39746","doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:42:59.678+00:00"},"s":"I", "c":"NETWORK", "id":22943, "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:39760","isLoadBalanced":false,"uuid":{"uuid":{"$uuid":"84a6824c-7b82-400d-95ba-f6174dd098d7"}},"connectionId":405,"connectionCount":174}}
{"t":{"$date":"2025-11-22T14:42:59.679+00:00"},"s":"I", "c":"NETWORK", "id":51800, "ctx":"conn405","msg":"client metadata","attr":{"remote":"127.0.0.1:39760","client":"conn405","negotiatedCompressors":[],"doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:42:59.679+00:00"},"s":"I", "c":"ACCESS", "id":10483900,"ctx":"conn405","msg":"Connection not authenticating","attr":{"client":"127.0.0.1:39760","doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:43:01.017+00:00"},"s":"I", "c":"NETWORK", "id":22943, "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:39772","isLoadBalanced":false,"uuid":{"uuid":{"$uuid":"8a725e2d-f220-47ec-99ec-188d1538fcf1"}},"connectionId":406,"connectionCount":175}}
{"t":{"$date":"2025-11-22T14:43:01.018+00:00"},"s":"I", "c":"NETWORK", "id":51800, "ctx":"conn406","msg":"client metadata","attr":{"remote":"127.0.0.1:39772","client":"conn406","negotiatedCompressors":[],"doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:43:01.018+00:00"},"s":"I", "c":"ACCESS", "id":10483900,"ctx":"conn406","msg":"Connection not authenticating","attr":{"client":"127.0.0.1:39772","doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:43:01.174+00:00"},"s":"I", "c":"NETWORK", "id":22943, "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:39776","isLoadBalanced":false,"uuid":{"uuid":{"$uuid":"956eb07d-54c8-4d05-afd5-b0ddba1b0e38"}},"connectionId":407,"connectionCount":176}}
{"t":{"$date":"2025-11-22T14:43:01.175+00:00"},"s":"I", "c":"NETWORK", "id":51800, "ctx":"conn407","msg":"client metadata","attr":{"remote":"127.0.0.1:39776","client":"conn407","negotiatedCompressors":[],"doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:43:01.175+00:00"},"s":"I", "c":"ACCESS", "id":10483900,"ctx":"conn407","msg":"Connection not authenticating","attr":{"client":"127.0.0.1:39776","doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:43:02.471+00:00"},"s":"I", "c":"NETWORK", "id":22943, "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:41002","isLoadBalanced":false,"uuid":{"uuid":{"$uuid":"ddaf6cfd-82ef-478e-b600-ce546a63d81f"}},"connectionId":408,"connectionCount":177}}
{"t":{"$date":"2025-11-22T14:43:02.471+00:00"},"s":"I", "c":"NETWORK", "id":51800, "ctx":"conn408","msg":"client metadata","attr":{"remote":"127.0.0.1:41002","client":"conn408","negotiatedCompressors":[],"doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:43:02.471+00:00"},"s":"I", "c":"ACCESS", "id":10483900,"ctx":"conn408","msg":"Connection not authenticating","attr":{"client":"127.0.0.1:41002","doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:43:02.664+00:00"},"s":"I", "c":"NETWORK", "id":22943, "ctx":"listener","msg":"Connection accepted","attr":{"remote":"127.0.0.1:41010","isLoadBalanced":false,"uuid":{"uuid":{"$uuid":"b348f820-4026-427c-920c-0800dd07d855"}},"connectionId":409,"connectionCount":178}}
{"t":{"$date":"2025-11-22T14:43:02.664+00:00"},"s":"I", "c":"NETWORK", "id":51800, "ctx":"conn409","msg":"client metadata","attr":{"remote":"127.0.0.1:41010","client":"conn409","negotiatedCompressors":[],"doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
{"t":{"$date":"2025-11-22T14:43:02.665+00:00"},"s":"I", "c":"ACCESS", "id":10483900,"ctx":"conn409","msg":"Connection not authenticating","attr":{"client":"127.0.0.1:41010","doc":{"driver":{"name":"nodejs|Mongoose","version":"7.0.0|9.0.0"},"platform":"Node.js v22.17.1, LE","os":{"name":"linux","architecture":"x64","version":"6.8.0-87-generic","type":"Linux"}}}}
Additionally, here is the result of adminCommand.connections:
{
current: 242,
available: 25358,
totalCreated: 285,
rejected: 0,
active: 23,
queuedForEstablishment: Long('0'),
establishmentRateLimit: {
rejected: Long('0'),
exempted: Long('0'),
interruptedDueToClientDisconnect: Long('0')
},
threaded: 242,
exhaustIsMaster: Long('0'),
exhaustHello: Long('18'),
awaitingTopologyChanges: Long('19'),
loadBalanced: Long('0')
}Steps to Reproduce
I am using mongoose as expected in an application, connecting on server startup and disconnecting on server shutdown
await connect(`mongodb://127.0.0.1:27017/${config.dbName}`)
// ... in shutdown ...
await disconnect()Note that I'm not using authentication (as this is a local instance)
Expected Behavior
It should not have a problem to connect