MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaustion (CVE-2026-81520) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-81520

MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaustion

Answer in brief

CVE-2026-81520 records a Unknown severity vulnerability in MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaustion. The current sources do not mark it as known exploited. The current feed maps MongoDB/BI Connector (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps MongoDB/BI Connector (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
MongoDB/BI Connectorgeneric	>=0 <2.14.31	2.14.31

Recommended response

Check inventory. Check lockfiles and deployed manifests for MongoDB/BI Connector.
Review the reported fix. Update MongoDB/BI Connector to 2.14.31 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Source referencemongodb.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.