CVE-2026-81517Network attack vector

Unauthenticated service interruption via unhandled logging errors

Published Aug 28, 2026 · Updated Aug 28, 2026

Improper error handling in MongoDB Connector for BI before 2.14.31 allows remote attackers to interrupt SQL service via log exhaustion. The mongosqld logging path fails to handle errors from log writes or rotation after connection activity fills its backing storage, terminating the shared process. Network access to the listener is sufficient; all connected SQL clients lose service, and startup continues to fail while the log storage remains full.

CVSS severity8.7
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper error handling in MongoDB Connector for BI before 2.14.31 allows remote attackers to interrupt SQL service via log exhaustion. The mongosqld logging path fails to handle errors from log writes or rotation after connection activity fills its backing storage, terminating the shared process. Network access to the listener is sufficient; all connected SQL clients lose service, and startup continues to fail while the log storage remains full.

The record

CVE
CVE-2026-81517
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
MongoDB
Product
MongoDB Connector for BI
Classifications
CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2.14.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MongoDB · MongoDB Connector for BIversion=0 <2.14.31

Published CVSS scores

7.5MongoDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7MongoDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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