An incorrect numeric type conversion in the BSON document building component of the MongoDB C++ Driver may cause a length value to be interpreted incorrectly. When an application supplies an extremely large, non-terminated field name to the builder, the library may read memory outside the intended buffer and terminate the calling process. No authentication is required, but the calling application must pass the oversized name in a specific form.
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References
| Link | Providers |
|---|---|
| https://jira.mongodb.org/browse/CXX-3548 |
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History
Thu, 03 Sep 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | An incorrect numeric type conversion in the BSON document building component of the MongoDB C++ Driver may cause a length value to be interpreted incorrectly. When an application supplies an extremely large, non-terminated field name to the builder, the library may read memory outside the intended buffer and terminate the calling process. No authentication is required, but the calling application must pass the oversized name in a specific form. | |
| Title | BSON element injection via NUL-embedded document keys in builder append | |
| Weaknesses | CWE-681 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: mongodb
Published:
Updated: 2026-09-03T15:38:58.400Z
Reserved: 2026-09-02T17:58:52.742Z
Link: CVE-2026-84966
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Weaknesses