Cloudanix VulnDB

CVE-2026-120954

Low · 3.7

CVSS

3.7

EPSS

0.2%

Published

Nov 3, 2026

CISA due date

—

The record

A weakness in the BSON library's handling of a specialized binary vector data type allows an arithmetic wraparound when computing the number of elements described by an oversized attacker-supplied value. On builds where the platform word size is 32 bits, an application that parses untrusted BSON data can be made to process only a small fraction of the supplied elements while the operation reports success, producing results that disagree with byte-oriented accessors and with 64-bit builds of the same library. No authentication or user interaction is required beyond getting the application to parse the data. The impact is limited to data integrity; memory safety is not affected and no information is disclosed.

Affected packages

Ecosystem Package Introduced Fixed

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