# CVE-2020-7610: MongoDB bson deserialization of untrusted data

Source: https://junglewise.ai/threats/cve-2020-7610-mongodb-bson-deserialization-of-untrusted-data  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-05-07. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2020-7610 · Severity: low · CVSS 3.1 · Published 2021-05-07

The bson JavaScript library, used to parse and serialize binary data in MongoDB applications, fails to validate the _bsontype field during deserialization. An attacker can supply a malicious bson object with an invalid _bsontype value, causing it to be serialized as a generic document instead of the intended type, potentially leading to type confusion attacks that bypass application logic or expose sensitive data.

Technologies: [bson (npm)](https://junglewise.ai/threats/technologies/bson). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2020-7610 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-7610 being exploited in the wild.

**How severe is CVE-2020-7610?** Low severity, with a CVSS score of 3.1, published 7 May 2021.

**Which products and versions are affected?** bson (npm) SEMVER:introduced=0,fixed=1.1.4.

**Is there a fix for CVE-2020-7610?** Yes. bson (npm): upgrade to 1.1.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2020-7610 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2020-7610?** Check whether you run bson (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- bson (npm): upgrade to 1.1.4 or later

  ```sh
  npm install bson@1.1.4
  ```


## Technical details

This is a deserialization vulnerability (CWE-502) in the bson npm package affecting all versions before 1.1.4. The vulnerability arises because the serializer ignores unknown or invalid values for the _bsontype property during object serialization, allowing an attacker to construct a malicious object that will be serialized as an unintended BSON type. The attack requires no authentication or user interaction and is remotely exploitable over the network. An attacker can craft a payload with an invalid _bsontype to cause type confusion, potentially bypassing security checks or enabling object injection attacks. The vulnerability was patched in version 1.1.4 to throw an error when an invalid _bsontype is detected during serialization.

## Affected products

- MongoDB bson before 1.1.4

## Identifiers

- CVE-2020-7610
- GHSA-v8w9-2789-6hhr

## Timeline

- 2021-05-07: disclosed: GHSA-v8w9-2789-6hhr published
- 2020-03-30: patched: CVE-2020-7610 reported; fix committed to js-bson

## References

- [https://github.com/mongodb/js-bson/commit/3809c1313a7b2a8001065f0271199df9fa3d16a8](https://github.com/mongodb/js-bson/commit/3809c1313a7b2a8001065f0271199df9fa3d16a8)

## Related threats

- [MongoDB js-bson deserialization of untrusted data](https://junglewise.ai/threats/cve-2019-2391-mongodb-js-bson-deserialization-of-untrusted-data)
- [MongoDB js-bson regular expression denial of service](https://junglewise.ai/threats/cve-2018-13863-mongodb-js-bson-regular-expression-denial-of-service)