Use-After-Free in MongoDB Server Cursor Management

Publication date: 2026-09-08

Last updated on: 2026-09-08

Assigner: MongoDB, Inc.

Description

A use-after-free security issue in the cursor management component of MongoDB Server allows an authenticated user to cause a denial of service. Under specific timing conditions during cursor operations, a stale pointer to a freed resource may be retained and subsequently dereferenced during cursor cleanup, leading to a server process crash.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-08

Last Modified

2026-09-08

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-82063

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 is a use-after-free issue in MongoDB Server's cursor management. It occurs when an authenticated user triggers specific timing conditions during cursor operations, causing a stale pointer to a freed resource to be retained. This pointer may later be dereferenced during cursor cleanup, leading to a server crash.

Impact Analysis

This vulnerability can cause a denial of service by crashing the MongoDB server process. If exploited, it may disrupt database operations, leading to service unavailability for applications relying on MongoDB.

Mitigation Strategies

Update MongoDB Server to the latest patched version to address the use-after-free issue in cursor management.

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