Vulnerability in MongoDB C# Driver
CVE-2026-114647
The MongoDB C# Driver does not reject replacement documents whose top-level field names begin with a dollar sign in FindOneAndReplace, unlike other replace operations. An application that builds such a document from user-supplied field names can have the server apply update operators instead of a full replacement. The effect is limited to the document matched by the application's own filter, whose contents can be modified in ways the application did not intend.
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-114647?
- CVE-2026-114647 is a medium-severity vulnerability in MongoDB C# Driver, classified under Improper Neutralization of Special Elements in Data Query Logic. CVSS score: 4.3/10. Published 2026-10-22.
- How severe is CVE-2026-114647?
- Medium severity. CVSS v3 base score is 4.3 out of 10.