Uncontrolled Recursion Affecting parse-server package, versions <8.6.56>=9.0.0 <9.6.0-alpha.45
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published23 Mar 2026
- disclosed20 Mar 2026
- creditMithun M
Introduced: 20 Mar 2026
CVE-2026-33508 (opens in a new tab)How to fix?
Upgrade parse-server to version 8.6.56, 9.6.0-alpha.45 or higher.
Overview
parse-server is a version of the Parse backend that can be deployed to any infrastructure that can run Node.js.
Affected versions of this package are vulnerable to Uncontrolled Recursion via the requestComplexity.queryDepth configuration setting when processing WebSocket subscription requests. An attacker can cause excessive recursion and CPU consumption by sending a subscription with deeply nested logical operators, potentially degrading or disrupting service availability.
Note: This is only exploitable if the LiveQuery WebSocket endpoint is accessible to untrusted clients.