CVE-2026-33508: Parseplatform Parse-Server

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.56 and 9.6.0-alpha.45, Parse Server's LiveQuery component does not enforce the requestComplexity.queryDepth configuration setting when processing WebSocket subscription requests. An attacker can send a subscription with deeply nested logical operators, causing excessive recursion and CPU consumption that degrades or disrupts service availability. This issue has been patched in versions 8.6.56 and 9.6.0-alpha.45.

Affected products

• Parseplatform Parse-Server: before 8.6.56 (fixed in 8.6.56); from 9.0.0, before 9.6.0 (fixed in 9.6.0); version 9.6.0 only

Published 2026-03-24. Last modified 2026-06-17.