CVE-2026-81517— MongoDB Connector for BI Improper Error Handling of Log Write Failures May Cause Loss of SQL Service
Quick assessment
Affected
MongoDB BI Connector
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
MongoDB BI Connector是美国MongoDB公司的一个连接商业智能工具与数据库的桥梁。 MongoDB BI Connector 2.14.31之前版本存在异常处理不当漏洞，该漏洞源于未正确处理日志写入或日志轮转失败，可能导致未经身份验证的攻击者通过生成大量常规连接日志耗尽存储，造成拒绝服务。
Possible ATT&CK Techniques 3 AI
T1027 · Obfuscated Files or Information T1190 · Exploit Public-Facing Application T1444Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| MongoDB | BI Connector | < 2.14.31 |
affected |
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I. Basic Information for CVE-2026-81517
Vulnerability Information
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Vulnerability Title
MongoDB Connector for BI Improper Error Handling of Log Write Failures May Cause Loss of SQL Service
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
MongoDB BI Connector 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MongoDB BI Connector是美国MongoDB公司的一个连接商业智能工具与数据库的桥梁。 MongoDB BI Connector 2.14.31之前版本存在异常处理不当漏洞，该漏洞源于未正确处理日志写入或日志轮转失败，可能导致未经身份验证的攻击者通过生成大量常规连接日志耗尽存储，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MongoDB | BI Connector | 0 ~ 2.14.31 | - |
|
II. Public POCs for CVE-2026-81517
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Same Patch Batch · MongoDB · 2026-08-28 · 11 CVEs total
| CVE-2026-81532 | 8.8 HIGH | BI Connector ODBC Driver Improper Bounds Checking on Cursor Name Leading to Memory Corrupt |
| CVE-2026-77586 | 8.0 HIGH | MongoDB Connector for BI Unescaped Object Names in Generated SHOW CREATE Output |
| CVE-2026-81490 | 7.7 HIGH | MongoDB Connector for BI Improper Error Handling During Schema Sampling May Cause Loss of |
| CVE-2026-81518 | 7.5 HIGH | BI Connector Optional Client Certificate Verification Allows Unauthenticated Connections |
| CVE-2026-81520 | 7.5 HIGH | MongoDB Connector for BI Unbounded Authentication Negotiation Leading to Connection Exhaus |
| CVE-2026-81533 | 7.1 HIGH | MongoDB BI Connector ODBC Driver Memory-Safety Issue When Parsing Oversized LIMIT Values |
| CVE-2026-76798 | 6.3 MEDIUM | MongoSQL Transition Readiness Tool Improper Output Encoding in Generated HTML Reports |
| CVE-2026-76797 | 6.3 MEDIUM | MongoSQL Transition Readiness Tool Improper Neutralization of Formula Elements in Generate |
| CVE-2026-77184 | 5.2 MEDIUM | MongoDB Connector for BI Incomplete Escaping of Stored Metadata in Generated SHOW CREATE O |
| CVE-2026-76794 | 4.6 MEDIUM | MongoDB BI Connector Transition Readiness Report Improper HTML Encoding When Processing Da |
IV. Related Vulnerabilities
Same product: BI Connector
-
CVE-2026-81520
MongoDB Connector for BI Unbounded Authentication Negotiatio -
CVE-2026-81518
BI Connector Optional Client Certificate Verification Allows -
CVE-2026-81490
MongoDB Connector for BI Improper Error Handling During Sche -
CVE-2026-77586
MongoDB Connector for BI Unescaped Object Names in Generated -
CVE-2026-77184
MongoDB Connector for BI Incomplete Escaping of Stored Metad
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Same weakness: CWE-248
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