CVE-2026-84963
Silent field truncation via unchecked int cast of huge JSON string values in JSON-to-BSON parser
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
An incorrect numeric conversion in the JSON parsing component of the MongoDB C Driver's BSON library may cause an unusually large text value to be silently shortened, or the corresponding field to be omitted, while the parsing operation still reports success and returns no error. An unauthenticated party who can supply the input processed by an application that uses this component may cause that application to hold data that does not match what was submitted, which may result in unintended alteration of data.
| CWE | CWE-681 |
| Vendor | mongodb |
| Product | c driver |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 3, 2026 |
| Last Updated | Sep 3, 2026 |
Stay Ahead of the Next One
Get instant alerts for mongodb c driver
Be the first to know when new medium vulnerabilities affecting mongodb c driver are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
MongoDB / C Driver
1.10.0 < 1.30.9 2.0.0 < 2.5.2