CVE-2026-82057: Type Confusion in MongoDB Server WiredTiger Storage Engine via Custom Collection Configuration Leads to Persistent Denial of Service
A security issue was discovered in MongoDB where an authenticated user with readWrite privileges could crash the mongod server process. By specifying a custom WiredTiger storage configuration option with an incompatible value during collection creation, a user could cause a type confusion in the storage engine layer. When documents were subsequently read from the misconfigured collection, the resulting mismatch in expected data format led to corrupted memory interpretation and a server crash. The crafted collection configuration persists across restarts, requiring manual operator intervention to remediate.
Affected Software
Event History
Frequently Asked Questions
Who can exploit this issue?
An authenticated user with readWrite privileges can trigger it. The issue is remotely reachable and does not require user interaction.
What action triggers the server crash?
The user creates a collection with a custom WiredTiger storage configuration option set to an incompatible value. A later read of documents from that collection causes the storage-engine type confusion and can crash mongod.
Will restarting mongod resolve the condition?
No. The crafted collection configuration persists across restarts, so the condition requires manual operator intervention to remediate.