Denial of Service Vulnerability in Parse Server by Parse Community
CVE-2026-33498

8.7HIGH

Key Information:

Vendor

Parse-community

Status
Parse-server
Vendor
CVE Published:
24 March 2026

What is CVE-2026-33498?

The Parse Server, an open source backend designed to run on Node.js, is susceptible to a Denial of Service attack prior to the patched versions 8.6.55 and 9.6.0-alpha.44. Attackers can exploit this vulnerability by issuing unauthenticated HTTP requests containing deeply nested queries with logical operators, causing the Parse Server process to hang indefinitely. As a result, the server becomes non-responsive and requires manual restarting to restore functionality. This vulnerability effectively bypasses the fix implemented for a previous issue and emphasizes the critical need for users to update to the latest versions to safeguard against such attacks.

Affected Version(s)

parse-server < 8.6.55 < 8.6.55

parse-server >= 9.0.0, < 9.6.0-alpha.44 < 9.0.0, 9.6.0-alpha.44

References

https://github.com/parse-community/parse-server/security/...
x_refsource_CONFIRM
https://github.com/parse-community/parse-server/pull/10257
x_refsource_MISC
https://github.com/parse-community/parse-server/pull/10258
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.