CVE-2026-30835: parse-server Malformed $regex Query Leaks Database Error Details
Summary
CVE-2026-30835: parse-server: Malformed $regex query leaks database error details in API response. Affects parse-server across 2 version ranges.
< 8.6.7
>= 9.0.0, < 9.5.0-alpha.6
Fixed in 8.6.7 or 9.5.0-alpha.6, depending on the release line you run. How to fix ↓
Also tracked for
- parse · Bitnami
The same CVE-2026-30835 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
Parse Server is an open-source backend framework that provides a complete solution for building applications. It offers features such as data storage, user authentication, and real-time notifications. However, it is susceptible to vulnerabilities that can expose sensitive information, particularly when handling malformed queries.
Vulnerability Detail
The vulnerability arises from the handling of malformed $regex query parameters, such as '[abc)'. When such a query is executed, the database returns a structured error object that is not sanitized before being sent back through the API response. This can lead to the exposure of sensitive database internals, including error messages, error codes, and other critical information. The vulnerability is exploitable by any client capable of sending query requests, depending on the permission settings of the deployment.
How To Fix
Latest published version: 9.10.5 as of 22 Oct 2026
npm install parse-server@9.10.5Upgrading to it may include breaking changes; the versions below are the minimum fixed release for this vulnerability.
If you can't move to the latest
The minimum fixed version depends on the release line you run.
-
< 8.6.78.6.7npm install parse-server@8.6.7 -
>= 9.0.0, < 9.5.0-alpha.69.5.0-alpha.6npm install parse-server@9.5.0-alpha.6
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
There are no workarounds available other than upgrading to the patched versions mentioned above. The error leakage occurs at the query execution layer and cannot be mitigated through server configuration or client-side changes.
Conclusion
In summary, CVE-2026-30835 is a significant vulnerability in parse-server that can lead to the leakage of sensitive database information through malformed $regex queries. It is crucial to upgrade to the patched versions to mitigate this risk.
See every vulnerability recorded for parse-server →
FAQ
CVE-2026-30835 is a vulnerability in parse-server that allows malformed $regex queries to leak sensitive database error details through API responses.
You can check if your application is affected by using Vulert, which monitors and alerts in real-time for open-source vulnerabilities. Visit Vulert Scanner to analyze your package-lock.json without any signup.
The consequences include the potential exposure of sensitive database internals, which could lead to unauthorized access or exploitation of the database.
Unfortunately, there are no effective workarounds to prevent this vulnerability other than upgrading to the patched versions.
The CVSS score for this vulnerability is 6.9, indicating a moderate level of severity.
Related vulnerabilities
Recent vulnerabilities recorded for parse-server.
