CVE-2026-18700

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Memory Corruption in MongoDB Server via Geospatial Validator

Publication date: 2026-08-11

Last updated on: 2026-08-28

Assigner: MongoDB, Inc.

Description

An issue in MongoDB Server's geospatial validation could allow an authenticated user with write privileges to cause an internal reference to be used after the underlying memory has been freed, through concurrent operations against a collection using a certain type of validator. This could result in a server crash, leading to a denial of service.

CVSS Scores

EPSS Scores

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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-2026-18700

EUVD

EUVD-2026-56913

Affected Vendors & Products

Vendor	Product	Version / Range
mongodb	mongodb_server	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This vulnerability in MongoDB Server's geospatial validation allows an authenticated user with write privileges to exploit a use-after-free condition through concurrent operations on a collection with a specific validator. This can cause the server to crash, resulting in a denial of service.

Detection Guidance

This vulnerability involves a use-after-free issue in MongoDB's geospatial validation. Detection requires monitoring for server crashes or unusual memory access patterns during geospatial operations. Check MongoDB logs for segmentation faults or assertion failures after executing geospatial queries. No specific commands are provided in the context to directly detect this issue.

Impact Analysis

If exploited, this vulnerability could cause your MongoDB server to crash, leading to service disruption and potential data unavailability. It requires an authenticated user with write access, so unauthorized users cannot trigger it directly.

Compliance Impact

This vulnerability causes a server crash leading to denial of service, which could disrupt data availability. For GDPR, this may impact data processing operations requiring uninterrupted access. For HIPAA, it could affect systems handling protected health information by causing service disruptions.

Mitigation Strategies

Update MongoDB Server to the latest patched version immediately to address the use-after-free issue in geospatial validation. Ensure only authenticated users with necessary privileges have write access to collections using geospatial validators.

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