How severe is CVE-2019-2391?

CVE-2019-2391 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2019-2391 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-2391?

CVE-2019-2391 affects Mongodb Js-bson. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-2391?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-2391 published?

CVE-2019-2391 was published on 2020-03-31 and last updated on 2026-06-17.

CVE-2019-2391

CVE-2019-2391 is a medium-severity vulnerability in Mongodb Js-bson with a CVSS 3.x base score of 4.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: Medium (CVSS 3.x base score 4.2)
CVSS v2: 5.5
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Mongodb Js-bson
Published: 2020-03-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2019-2391?: 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.
How severe is CVE-2019-2391?: CVE-2019-2391 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2019-2391 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-2391?: CVE-2019-2391 affects Mongodb Js-bson. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-2391?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-2391 published?: CVE-2019-2391 was published on 2020-03-31 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:mongodb:js-bson:*:*:*:*:*:*:*:*

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