CVE-2026-33498

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.55 and 9.6.0, an attacker can send an unauthenticated HTTP request with a deeply nested query containing logical operators to permanently hang the Parse Server process. The server becomes completely unresponsive and must be manually restarted. This is a bypass of the fix for CVE-2026-32944. This issue has been patched in versions 8.6.55 and 9.6.0

How to fix CVE-2026-33498

To remediate CVE-2026-33498, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.55 or later
• —upgrade to 9.6.0-alpha.44 or later

Is CVE-2026-33498 being exploited?

Low — EPSS is 0.5%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 8.6.55, >= 9.0.0, < 9.6.0
• >= 9.0.0, < 9.6.0-alpha.44

CVSS scores

References (7)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-33498
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/commit/2581b5426047ce9cbcd3d9c0e8379e9c30e23ab5
• WEBgithub.com/parse-community/parse-server/commit/85994eff9e7b34cac7e1a2f5791985022a1461d1