CVE-2026-84963 — Silent field truncation via unchecked int cast of huge JSON string values in JSON-to-BSON parser

CVE-2026-84963

Silent field truncation via unchecked int cast of huge JSON string values in JSON-to-BSON parser PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
MongoDB / C Driver	affected 1.10.0 before 1.30.9; affected 2.0.0 before 2.5.2

CWE

CWE-681

References

https://jira.mongodb.org/browse/CDRIVER-6407

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.