MongoDB Queryable Encryption Parameter Validation Failure Crash
CVE-2026-18687 Published on August 11, 2026
Improper Validation in MongoDB Queryable Encryption Maintenance Operation Leads to Denial of Service and Index Corruption
MongoDB Server's handling of a Queryable Encryption maintenance operation did not properly validate certain request parameters against the collection's encrypted field configuration before use. An authenticated user with readWrite privileges could submit a specially formed request that leads to a server crash or excessive internal writes, resulting in resource exhaustion and corruption of encrypted index data.
Vulnerability Analysis
CVE-2026-18687 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 availability.
Weakness Type
What is an Integer underflow Vulnerability?
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This can happen in signed and unsigned cases.
CVE-2026-18687 has been classified to as an Integer underflow vulnerability or weakness.
Products Associated with CVE-2026-18687
Want to know whenever a new CVE is published for MongoDB? stack.watch will email you.
Affected Versions
MongoDB Server:- Version 8.3.0 and below 8.3.8 is affected.
- Version 8.0 and below 8.0.29 is affected.