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BIT-parse-2026-30835 — Parse Server: Malformed `$regex` query leaks database error details in API response

2026-10-07T02:53:10.529474+00:00

Affected: Bitnami: parse

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, 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.

EUVD-2026-275098

2026-10-07T02:53:10.529536+00:00

EUVD-2026-275098

fkie_cve-2026-30835

2026-10-07T02:53:10.529554+00:00

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.

GHSA-9cp7-3q5w-j92g — parse-server: Malformed `$regex` query leaks database error details in API response

2026-10-07T02:53:10.529582+00:00

Affected: npm: parse-server

### Impact

A 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.

### Patches

The fix sanitizes database error objects so that only a generic `"An internal server error occurred"` message is returned to clients, while the detailed error is logged server-side. The fix respects the `enableSanitizedErrorResponse` server option.

### Workarounds

There is no workaround other than upgrading. The error leakage occurs in the query execution layer and cannot be mitigated through server configuration or client-side changes.

### Resources

- GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-9cp7-3q5w-j92g - Fix in Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.6 - Fix in Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.7