MongoDB Replica Set Oplog Fetch Failure Causing Crash
CVE-2026-1847 Published on February 10, 2026
MongoDB Server may crash when inserting large documents
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.
Vulnerability Analysis
CVE-2026-1847 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-1847
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Affected Versions
MongoDB Inc MongoDB Server:- Version 8.0 and below 8.0.18 is affected.
- Version 7.0 and below 7.0.29 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.