CVE-2026-30939 Parse Server has Denial of Service (DoS) and Cloud Function Dispatch Bypass via Prototype Chain Resolution
Unauthenticated attackers can crash Parse Server via infinite recursion or bypass Cloud Function validation using prototype chain properties.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-30939?
CVE-2026-30939 is a high-severity denial of service vulnerability in Parseplatform Parse-Server, published on 10 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.13 and 9.5.1-alpha.2, an unauthenticated attacker can crash the Parse Server process by calling a Cloud Function endpoint with a prototype property name as the function name. The server recurses infinitely, causing a call stack size error that terminates the process. Other prototype property names bypass Cloud Function dispatch validation and return HTTP 200 responses, even though no such Cloud Functions are defined. The same applies to dot-notation traversal. All Parse Server deployments that expose the Cloud Function endpoint are affected. This vulnerability is fixed in 8.6.13 and 9.5.1-alpha.2.
Weakness: CWE-1321
Which versions are affected by CVE-2026-30939?
5 open source packages ship an affected version, including parse-server and parse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
parse-server npm | All versions | 8.6.13 |
parse-server npm | All versions | 8.6.13 |
parse-server npm | From 9.0.0-alpha.1 | 9.5.1-alpha.2 |
parse-server npm | From 9.0.0-alpha.1 | 9.5.1-alpha.2 |
parse Bitnami | All versions | 8.6.13, 9.5.1 |
Products include Parseplatform Parse-Server.
How do I fix CVE-2026-30939?
Upgrade parse-server to a fixed version for your release line: 8.6.13 or 9.5.1-alpha.2.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-30939 being exploited?
There is no known exploitation of CVE-2026-30939 in the wild and no public exploit code.
Other vulnerabilities in Parseplatform Parse-Server
- CVE-2026-30966 Parse Server role escalation and CLP bypass via direct `_Join` table write
- CVE-2024-27298 Parse Server literalizeRegexPart SQL Injection
- CVE-2022-24760 Command Injection in Parse server
- CVE-2026-30965 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
- CVE-2023-36475 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution
Sources
Also known as BIT-parse-2026-30939, GHSA-5j86-7r7m-p8h6.