CVE-2026-30835

Description

### 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

How to fix CVE-2026-30835

To remediate CVE-2026-30835, upgrade the affected package to a fixed version below.

• —upgrade to 9.5.0 or later
• —upgrade to 9.5.0-alpha.6 or later

Is CVE-2026-30835 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 9.5.0
• >= 9.0.0, < 9.5.0-alpha.6

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-30835
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/releases/tag/8.6.7
• WEBgithub.com/parse-community/parse-server/releases/tag/9.5.0-alpha.6