CVE-2026-32886: Parse Server Prototype Chain Traversal Vulnerability
Summary
CVE-2026-32886: Parse Server's Cloud function dispatch crashes server via prototype chain traversal. Affects parse across 2 version ranges.
< 8.6.47
>= 9.0.0, < 9.6.0
Fixed in 8.6.47 or 9.6.0, depending on the release line you run. How to fix ↓
Also tracked for
- parse-server · npm
The same CVE-2026-32886 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
Parse Server is an open-source backend platform that enables developers to build applications with a robust server-side infrastructure. It is designed to run on any environment that supports Node.js, providing features such as data storage, user management, and cloud functions. However, prior to versions 9.6.0 and 8.6.47, Parse Server was susceptible to a vulnerability that allowed remote clients to exploit the cloud function dispatch mechanism, leading to potential server crashes.
Vulnerability Detail
The vulnerability arises from the way Parse Server handles cloud function names. Attackers can craft function names that traverse the JavaScript prototype chain of registered cloud function handlers, resulting in a stack overflow and crashing the server process. This issue affects versions before 9.6.0 and 8.6.47, making it critical for users to update to the patched versions to mitigate the risk of exploitation.
How To Fix
Fixed versions by release line
The minimum fixed version depends on the release line you run.
-
< 8.6.478.6.47 -
>= 9.0.0, < 9.6.09.6.0
Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →
Workaround
There is no known workaround for this vulnerability. The only effective solution is to update to the patched versions of Parse Server.
Conclusion
CVE-2026-32886 is a significant vulnerability in Parse Server that can lead to server crashes through prototype chain traversal. Users are strongly advised to update to the latest versions to protect their applications from potential exploitation. Regular monitoring for vulnerabilities using tools like Vulert can help maintain application security.
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FAQ
CVE-2026-32886 is a vulnerability in Parse Server that allows remote clients to crash the server by exploiting the cloud function dispatch mechanism.
Versions prior to 9.6.0 and 8.6.47 are affected by this vulnerability.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
There is no workaround available for this vulnerability, so it is highly recommended to prioritize updating to the patched versions.
Failure to address this vulnerability could lead to server crashes, resulting in downtime and potential data loss for applications using Parse Server.
References
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