CVE-2019-2391: JS-bson may incorrectly serialise some requests

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-03-31 · updated 2026-06-17
Weakness: CWE-502

Description

Incorrect parsing of certain JSON input may result in js-bson not correctly serializing BSON. This may cause unexpected application behaviour including data disclosure. This issue affects: MongoDB Inc. js-bson library version 1.1.3 and prior to.

Affected products

MongoDB Inc. js-bson: before 1.1.4 — fixed in 1.1.4

How to fix

Upgrade to a fixed version: MongoDB Inc. js-bson 1.1.4. Check the vendor advisory for mitigations.

References

https://github.com/mongodb/js-bson/releases/tag/v1.1.4
https://github.com/mongodb/js-bson/releases/tag/v1.1.4

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