CVE-2026-84963
Awaiting Analysis Awaiting Analysis - Queue

Incorrect Numeric Conversion in MongoDB C Driver BSON Library

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: MongoDB, Inc.

Description
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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-03
AI Q&A
2026-09-03
EPSS Evaluated
N/A
NVD
CVE-2026-84963
EUVD
EUVD-2026-70515

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mongodb mongodb_c_driver *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-681 When converting from one data type to another, such as long to integer, data can be omitted or translated in a way that produces unexpected values. If the resulting values are used in a sensitive context, then dangerous behaviors may occur.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability involves an incorrect numeric conversion in the JSON parsing component of the MongoDB C Driver's BSON library. It causes large text values to be silently shortened or omitted during parsing, while the operation still reports success without errors. This can lead to data mismatches where the application holds incorrect data compared to what was submitted.

Impact Analysis

An unauthenticated attacker could exploit this to alter data processed by an application using the vulnerable component. This may result in unintended data corruption, loss of integrity, or incorrect system behavior, potentially affecting data accuracy and reliability.

Compliance Impact

This vulnerability could impact compliance by causing data integrity issues, which are critical under regulations like GDPR and HIPAA. Incorrect or altered data may violate accuracy requirements, leading to potential legal and regulatory penalties.

Mitigation Strategies

Update the MongoDB C Driver to the latest version that fixes the incorrect numeric conversion issue in the JSON parsing component. Review applications using the BSON library to ensure data integrity after parsing.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-84963. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart