CVE-2026-88026

Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver

Published Sep 10, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Mongodb c\# Driver
CPEs cpe:2.3:a:mongodb:c\#_driver:*:*:*:*:*:mongodb:*:*
Vendors & Products Mongodb c\# Driver
Type Values Removed Values Added
First Time appeared Mongodb
Mongodb c# Driver
Vendors & Products Mongodb
Mongodb c# Driver
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver
Weaknesses CWE-943
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mongodb
Published
Updated
Sep 10, 2026, 6:24 PM
Reserved
Sep 9, 2026, 7:49 PM
Status
Analyzed
Published
Sep 10, 2026, 6:18 PM
Modified
Sep 29, 2026, 4:17 PM