CVE-2026-18692

Awaiting Analysis Awaiting Analysis - Queue

Use-After-Free in MongoDB Server Timeseries Bucket Lifecycle

Publication date: 2026-08-11

Last updated on: 2026-08-28

Assigner: MongoDB, Inc.

Description

An issue in MongoDB Server's handling of timeseries bucket lifecycle could allow an authenticated user with write privileges to cause an internal reference to be used after the underlying memory has been freed. Subsequent operations could then result in a server crash or, potentially, execution of unintended code.

CVSS Scores

EPSS Scores

Probability:
Percentile:

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-2026-18692

EUVD

EUVD-2026-56905

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 involves MongoDB Server mishandling timeseries bucket lifecycle. An authenticated user with write privileges could exploit this to cause an internal reference to be used after the underlying memory is freed. This may lead to a server crash or potentially allow execution of unintended code.

Detection Guidance

Detection requires monitoring for server crashes or unusual behavior in MongoDB timeseries operations. Check MongoDB logs for segmentation faults or memory errors during timeseries bucket processing. Ensure your MongoDB version is updated to the latest patch to mitigate this issue.

Impact Analysis

An attacker could exploit this to crash the MongoDB server or run arbitrary code, potentially leading to data corruption, unauthorized access, or denial of service. Systems relying on MongoDB for critical operations are most at risk.

Compliance Impact

This vulnerability could lead to unauthorized data access or loss, violating GDPR's integrity and confidentiality requirements or HIPAA's safeguards for protected health information. Compliance may be compromised if exploited.

Mitigation Strategies

Update MongoDB Server to the latest patched version to address the timeseries bucket lifecycle issue. Ensure only trusted users have write privileges to prevent exploitation.

Hi! I’m here to help you understand CVE-2026-18692. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70