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    CVE-2026-81517

    An unauthenticated party able to reach the port of a MongoDB Connector for BI (mongosqld) instance may generate enough routine connection log activity to exhaust the storage backing the configured log path. When a log write or log rotation operation subsequently fails, the resulting error is not handled and the shared mongosqld process ends, ending service for all connected SQL clients. The process continues to end on startup until an operator restores available storage, and the diagnostic message explaining the condition is not recorded.

    Published:Aug 28, 2026
    Last Modified:Aug 31, 2026
    EPS:Aug 28, 2026
    EPSS Score:0.00263
    CVSS Score:7.5

    Affected Products

    Vendor
    Mongodb
    Product
    Bi Connector

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-248 Uncaught Exception

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-81520 (CVSS 8.7) — A network-reachable client that has not yet authenticated can hold a MongoDB Connector for BI authentication s…
    CVE-2026-81518 (CVSS 8.7) — When mongosqld is configured with a client certificate authority file, the listener requests a client certific…
    CVE-2026-81490 (CVSS 8.3) — A database user able to create a view in a namespace that MongoDB Connector for BI samples can cause the schem…
    CVE-2026-77586 (CVSS 8.5) — In MongoDB Connector for BI, MongoDB object names such as collection, field, and index names are placed into t…
    CVE-2026-77184 (CVSS 5.7) — In MongoDB Connector for BI, the description text of a collection's JSON schema validator is incorporated into…
    CVE-2026-75573 (CVSS 4.1) — In MongoDB Connector for BI, mongodrdl may write a TLS private-key password to standard error when the passwor…
    CVE-2026-75159 (CVSS 8.2) — An unauthenticated client that can reach a MongoDB Connector for BI deployment configured with Kerberos authen…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High