Vulnerability · Published Sep 10, 2026 · Assigned by mongodb
CVE-2026-88026Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver
Medium 6.5
In plain English
A medium-severity security flaw in C# Driver from MongoDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).
Official 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.
Affected products (as reported)
Weakness: CWE-943 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N