CVE-2026-88026
Received Received - Intake

Improper Regex Neutralization in MongoDB C# Driver

Publication date: 2026-09-10

Last updated on: 2026-09-10

Assigner: MongoDB, Inc.

Description
Improper neutralization of regular-expression metacharacters in the LINQ query translation component of the MongoDB C# Driver can cause a caller-supplied character sequence to alter a regular-expression predicate generated by an affected application. An authenticated user who can influence such a value may cause the application to return records beyond those intended by the original filter.

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Meta Information

Published
2026-09-10
Last Modified
2026-09-10
Generated
2026-09-10
AI Q&A
2026-09-10
EPSS Evaluated
N/A
NVD
CVE-2026-88026
EUVD
EUVD-2026-75640

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mongodb mongodb_csharp_driver *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-943 The product generates a query intended to access or manipulate data in a data store such as a database, but it does not neutralize or incorrectly neutralizes special elements that can modify the intended logic of the query.

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Executive Summary

This vulnerability involves improper handling of regular-expression metacharacters in the MongoDB C# Driver's LINQ query translation. An attacker with authentication can manipulate input to alter a regular-expression filter, causing the application to return unintended records beyond the original query scope.

Detection Guidance

This vulnerability involves improper neutralization of regular-expression metacharacters in MongoDB C# Driver queries. Detection requires reviewing application code for LINQ queries that use user-supplied input in regular expressions. Check MongoDB logs for unusual query patterns or unexpected record returns. No specific commands are provided in the context.

Impact Analysis

An attacker could access sensitive data beyond their intended permissions by exploiting this flaw. This may lead to unauthorized information disclosure, data leaks, or compliance violations depending on the exposed records.

Compliance Impact

This vulnerability could result in unauthorized data exposure, violating GDPR's data protection principles or HIPAA's confidentiality requirements. Organizations may face regulatory penalties, fines, or reputational damage due to non-compliance.

Mitigation Strategies

Update the MongoDB C# Driver to the latest patched version to address the improper neutralization of regular-expression metacharacters in the LINQ query translation component.

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