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Signals Exploited in the wild (KEV) 0 Patch available 2 No fix listed 0 Has CVE 2

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Weakness (CWE) CWE-681 Incorrect Conversion between Numeric Types 2

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Release: MongoDB C++ Driver 4.5.2 × Clear all filters

TI-2026-58389 CVE-2026-84966

BSON element injection via NUL-embedded document keys in builder append

Priority LOW 25

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.

CVSS 4.0MEDIUM 5.9· Local · No auth · No interaction · EPSS 0.00142 · Published 2026-09-03 · Fixed in 4.5.2 CWE-681

TI-2026-58393 CVE-2026-84970 · GHSA-j94p-2ppx-483m

Heap over-read or silent misparse via 32-bit truncation of JSON length in BSON JSON parser

Priority LOW 25

A numeric truncation weakness exists in the JSON parsing component of the MongoDB C++ Driver's BSON library.

CVSS 4.0MEDIUM 5.9· Local · No auth · No interaction · EPSS 0.00124 · Published 2026-09-03 · Fixed in 4.5.2 CWE-681

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