SEPTEMBER 18, 2026
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Case File

CVE-2026-81520

HIGH · CVSS 7.5 EPSS 0.24%

Source: NVD + CISA KEV + EPSS · Published 2026-08-28 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

Unauthenticated clients can exploit a vulnerability in the MongoDB Connector for BI by initiating a SASL-based login and then failing to complete it, leading to an indefinite retention of authentication sessions. This can exhaust connection resources, preventing legitimate users from accessing the database and potentially causing service disruptions. Organizations using Exchange and MongoDB should prioritize this issue to mitigate the risk of denial-of-service conditions.

CVE
CVE-2026-81520
Severity
HIGH
CVSS
7.5
EPSS
0.24%
Exchange MongoDB

Original NVD 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.