CVE-2026-1847
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Oplog Fetch Stalling in MongoDB Replica Sets Causes Crash

Publication date: 2026-02-10

Last updated on: 2026-02-25

Assigner: MongoDB, Inc.

Description
Inserting certain large documents into a replica set could lead to replica set secondaries not being able to fetch the oplog from the primary. This could stall replication inside the replica set leading to server crash.

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Meta Information

Published
2026-02-10
Last Modified
2026-02-25
Generated
2026-07-06
AI Q&A
2026-02-10
EPSS Evaluated
2026-07-05
NVD
CVE-2026-1847
EUVD
EUVD-2026-6736

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
mongodb mongodb From 7.0.0 (inc) to 7.0.29 (exc)
mongodb mongodb From 8.0.0 (inc) to 8.0.18 (exc)
mongodb mongodb From 8.2.0 (inc) to 8.2.4 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-770 The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

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Executive Summary

This vulnerability occurs when certain large documents are inserted into a MongoDB replica set. It can cause the secondary members of the replica set to fail to fetch the oplog (operation log) from the primary member. As a result, replication within the replica set can stall, potentially leading to a server crash.

Impact Analysis

The impact of this vulnerability is that it can cause replication to stall in a MongoDB replica set, which may lead to server crashes. This can result in downtime, loss of data synchronization between primary and secondary servers, and potential disruption of services relying on the database.

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