CVE-2026-18888Network attack vector

Application crash via unclamped float-to-text conversion

Published Aug 12, 2026 · Updated Aug 12, 2026

Out-of-bounds write in MongoDB BI Connector ODBC Driver before 1.4.9 allows remote authenticated users to crash reading applications. The floating-point-to-text conversion fails to clamp a large value to the destination buffer and writes beyond its end, corrupting adjacent memory. Exploitation requires the ability to store a sufficiently large floating-point value in a collection later read as text through the driver; the documented consequence is process termination.

CVSS severity7.1
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in MongoDB BI Connector ODBC Driver before 1.4.9 allows remote authenticated users to crash reading applications. The floating-point-to-text conversion fails to clamp a large value to the destination buffer and writes beyond its end, corrupting adjacent memory. Exploitation requires the ability to store a sufficiently large floating-point value in a collection later read as text through the driver; the documented consequence is process termination.

The record

CVE
CVE-2026-18888
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
MongoDB
Product
MongoDB BI Connector ODBC Driver
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=1.0.0 <1.4.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MongoDB · MongoDB BI Connector ODBC Driverversion=1.0.0 <1.4.9

Published CVSS scores

6.5MongoDB, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1MongoDB, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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