CVE-2026-81520MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaustion
Updated under an hour ago ()
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It affects MongoDB BI Connector. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-1088
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mongodb
- NVD analysis
- Analyzed
- Record last updated
- Aug 31, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
MongoDB BI Connector mongodb:bi_connector (from the name) | before 2.14.31 | CNA record |
mongodb bi_connector mongodb:bi_connector | before 2.14.31 | NVD |
References
- https://www.mongodb.com/docs/bi-connector/current/release-notes/vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.