A network-reachable client that has not yet authenticated can hold a MongoDB Connector for BI authentication session open indefinitely by beginning a SASL-based login exchange and then declining to complete it. Because the negotiation loop had no overall time bound and the read from the client had no deadline, each such session retains a worker, a client connection slot, and its associated backend database connections until the process is restarted. Repeated use of this behavior can consume the configured connection capacity and prevent legitimate users from establishing new sessions.
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Fixes

Solution

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Workaround

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History

Fri, 28 Aug 2026 22:00:00 +0000

Type Values Removed Values Added
Description A network-reachable client that has not yet authenticated can hold a MongoDB Connector for BI authentication session open indefinitely by beginning a SASL-based login exchange and then declining to complete it. Because the negotiation loop had no overall time bound and the read from the client had no deadline, each such session retains a worker, a client connection slot, and its associated backend database connections until the process is restarted. Repeated use of this behavior can consume the configured connection capacity and prevent legitimate users from establishing new sessions.
Title MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaustion
Weaknesses CWE-1088
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mongodb

Published:

Updated: 2026-08-28T20:22:42.151Z

Reserved: 2026-08-26T22:10:21.151Z

Link: CVE-2026-81520

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-28T22:16:54.650

Modified: 2026-08-28T22:16:54.650

Link: CVE-2026-81520

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses