CVE-2026-18701

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Denial of Service in MongoDB Server via Query Filter

Publication date: 2026-08-11

Last updated on: 2026-08-28

Assigner: MongoDB, Inc.

Description

An issue in MongoDB Server's query subsystem could allow an authenticated user with read privileges to cause the server process to terminate unexpectedly by submitting a specially formed query filter. This could result in a denial of service.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-28

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-18701

EUVD

EUVD-2026-56912

Affected Vendors & Products

Vendor	Product	Version / Range
mongodb	mongodb_server	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-843	The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

Attack-Flow Graph

Executive Summary

This vulnerability in MongoDB Server's query subsystem allows an authenticated user with read privileges to submit a specially crafted query filter that causes the server process to crash unexpectedly. This results in a denial of service as the server becomes unavailable.

Detection Guidance

This vulnerability can be detected by monitoring MongoDB server logs for unexpected terminations caused by query filters. Check for crashes or restarts in the MongoDB process logs. Ensure authentication is enforced and limit read privileges to reduce exposure.

Impact Analysis

If exploited, this vulnerability could disrupt database operations by crashing the MongoDB server. This may lead to temporary unavailability of services relying on the database, causing downtime and potential data access issues for users.

Compliance Impact

This vulnerability could impact compliance by causing unexpected server termination, potentially leading to data processing disruptions. For GDPR, this may affect availability of personal data processing. For HIPAA, it could disrupt access to protected health information. However, specific compliance impacts depend on implementation and mitigation measures.

Mitigation Strategies

Update MongoDB Server to the latest patched version to address the query filter issue. Restrict authenticated user privileges to only necessary read operations. Monitor server logs for unexpected terminations or unusual query patterns.

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