CVE-2026-1847 MongoDB Server may crash when inserting large documents

What is CVE-2026-1847?

CVE-2026-1847 is a high-severity denial of service vulnerability in Mongodb Mongodb, published on 10 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-770

Which versions are affected by CVE-2026-1847?

1 open source package ship an affected version, including mongodb. It affects 1 product.

Products include Mongodb Mongodb.

How do I fix CVE-2026-1847?

Upgrade mongodb to a fixed version for your release line: 7.0.29, 8.0.18 or 8.2.4.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-1847 being exploited?

There is no known exploitation of CVE-2026-1847 in the wild and no public exploit code.

Other vulnerabilities in Mongodb Mongodb

• CVE-2025-14847 MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Exploited High 8.7
• CVE-2026-82067 Auth bypass in MongoDB Server Critical 9.2
• CVE-2026-13072 MongoDB Improper Input Validation in Compute Mode External Data Processing Leading to Memory Corruption Critical 9.2
• CVE-2017-15535 Denial of service in n/a Critical 9.1
• CVE-2026-18691 Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure Critical 9.0

All Mongodb Mongodb vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-mongodb-2026-1847, GHSA-7m7c-8m4q-hv3m, MINI-44m7-fqrx-f3fq, MINI-p92c-h6p5-hgjv, UBUNTU-CVE-2026-1847.