Medium 6.5Published Sep 10, 2026

CVE-2026-88026Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver

Updated under an hour ago (2026-10-19 06:30 UTC)

Does this affect you?

It affects MongoDB C# Driver and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for MongoDB C# Driver

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-943
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mongodb
NVD analysis: Analyzed
Record last updated: Sep 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

MongoDB C# Driver mongodb:c_driver (from the name)	from 2.14.0 through 3.11.1	CNA record
mongodb c#_driver mongodb:c#_driver	from 2.14.0 before 3.11.2	NVD

References

https://jira.mongodb.org/browse/CSHARP-6177vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.