CVE-2026-4358
Received Received - Intake
Use-After-Free in MongoDB SBE Engine via $lookup Aggregation

Publication date: 2026-03-17

Last updated on: 2026-04-02

Assigner: MongoDB, Inc.

Description
A specially crafted aggregation query with $lookup by an authenticated user with write privileges can cause a double-free or use-after-free memory issue in the slot-based execution (SBE) engine when an in-memory hash table is spilled to disk.
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Meta Information
Published
2026-03-17
Last Modified
2026-04-02
Generated
2026-06-16
AI Q&A
2026-03-17
EPSS Evaluated
2026-06-14
NVD
CVE-2026-4358
EUVD
EUVD-2026-12639
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
mongodb mongodb From 7.0.0 (inc) to 7.0.31 (exc)
mongodb mongodb From 8.0.0 (inc) to 8.0.20 (exc)
mongodb mongodb From 8.2.0 (inc) to 8.2.6 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-415 The product calls free() twice on the same memory address.
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Executive Summary

This vulnerability occurs when an authenticated user with write privileges executes a specially crafted aggregation query using the $lookup operation. It can trigger a double-free or use-after-free memory issue in the slot-based execution (SBE) engine, specifically when an in-memory hash table is spilled to disk.

Impact Analysis

The vulnerability can lead to memory corruption issues such as double-free or use-after-free, which may cause application crashes or potentially allow an attacker to execute arbitrary code or disrupt service availability.

Compliance Impact

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Detection Guidance

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Mitigation Strategies

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