Summary
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
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.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
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.
Frequently Asked Questions
- What is CVE-2026-30835? CVE-2026-30835 is a medium-severity security vulnerability in parse-server (npm), affecting versions >= 9.0.0, < 9.5.0-alpha.6. It is fixed in 9.5.0-alpha.6, 8.6.7.
- Which versions of parse-server are affected by CVE-2026-30835? parse-server (npm) versions >= 9.0.0, < 9.5.0-alpha.6 is affected.
- Is there a fix for CVE-2026-30835? Yes. CVE-2026-30835 is fixed in 9.5.0-alpha.6, 8.6.7. Upgrade to this version or later.
- Is CVE-2026-30835 exploitable, and should I be worried? Whether CVE-2026-30835 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-30835 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-30835?
- Upgrade
parse-serverto 9.5.0-alpha.6 or later - Upgrade
parse-serverto 8.6.7 or later
- Upgrade