CVE-2026-81527: CWE-943: Improper Neutralization of Special Elements in Data Query Logic in MongoDB C# Driver
Description
CVE-2026-81527 is a medium severity vulnerability in the MongoDB C# Driver version 2.14.0. It involves improper neutralization of special elements in data query logic within the LINQ-to-aggregation query translation layer. This flaw allows application-supplied values to be interpreted as query logic rather than data, potentially altering query results or causing unintended data to be returned.
CVSS v4.0
Score 6.9medium
Affected software
MongoDB
C# Driver
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability exists in the LINQ-to-aggregation query translation layer of the MongoDB C# Driver 2.14.0. When user-controlled input is embedded in certain query constructs, special elements within these inputs are not properly escaped before the query is sent to the database. As a result, parts of the input may be interpreted as query logic, enabling an attacker who can supply such values to influence the query behavior and potentially alter returned data or query results.
Potential Impact
An attacker able to supply input incorporated into affected queries may cause unintended data exposure or modification of query results due to injection of query logic elements. This could lead to unauthorized data access or manipulation within the database through the vulnerable driver.
Mitigation Recommendations
No official fix or patch is currently available for this vulnerability. Users should monitor the vendor advisory for updates and consider implementing input validation or sanitization as a temporary mitigation to prevent injection of special query elements until an official fix is released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-08-26T22:14:18.098Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a909cffacd9273b49b2d386
Added to database: 08/27/2026, 20:24:31 UTC
Last enriched: 09/10/2026, 03:53:22 UTC
Last updated: 10/10/2026, 06:48:19 UTC
Views: 81
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