CVE-2026-82057: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in MongoDB MongoDB Server
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.
AI Analysis
Technical Summary
This vulnerability involves a type confusion (CWE-843) in MongoDB Server 8.3.0's WiredTiger storage engine. An authenticated user with readWrite privileges can create a collection with a custom storage configuration option that has an incompatible value. This causes a mismatch in expected data format when documents are read, resulting in corrupted memory interpretation and a crash of the mongod server process. The crafted collection configuration remains after server restarts, necessitating manual remediation.
Potential Impact
An attacker with readWrite privileges can cause a denial of service by crashing the mongod server process. The crash is triggered by a type confusion in the storage engine due to an incompatible configuration value. The persistent nature of the misconfiguration means the server remains unstable until manually corrected, potentially disrupting database availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict readWrite privileges to trusted users only and monitor for suspicious collection creation activities. Manual intervention is required to remediate affected collections after exploitation.
CVE-2026-82057: CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') in MongoDB MongoDB Server
Description
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.
CVSS v4.0
Score 7.1high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a type confusion (CWE-843) in MongoDB Server 8.3.0's WiredTiger storage engine. An authenticated user with readWrite privileges can create a collection with a custom storage configuration option that has an incompatible value. This causes a mismatch in expected data format when documents are read, resulting in corrupted memory interpretation and a crash of the mongod server process. The crafted collection configuration remains after server restarts, necessitating manual remediation.
Potential Impact
An attacker with readWrite privileges can cause a denial of service by crashing the mongod server process. The crash is triggered by a type confusion in the storage engine due to an incompatible configuration value. The persistent nature of the misconfiguration means the server remains unstable until manually corrected, potentially disrupting database availability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict readWrite privileges to trusted users only and monitor for suspicious collection creation activities. Manual intervention is required to remediate affected collections after exploitation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-08-27T22:51:18.857Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6aa03a25acd9273b49ec362d
Added to database: 09/08/2026, 16:39:01 UTC
Last enriched: 09/08/2026, 16:53:26 UTC
Last updated: 09/09/2026, 01:10:59 UTC
Views: 9
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