# CVE-2026-33508

## Summary

- **CVE ID:** CVE-2026-33508
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-674
- **Published:** Mar 24, 2026
- **Last Modified:** Mar 25, 2026

## Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.56 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

- parse-community — parse-server (< 8.6.56)
- parse-community — parse-server (>= 9.0.0, < 9.6.0-alpha.45)

## References

- [CNA](https://github.com/parse-community/parse-server/security/advisories/GHSA-6qh5-m6g3-xhq6)
- [CNA](https://github.com/parse-community/parse-server/pull/10259)
- [CNA](https://github.com/parse-community/parse-server/pull/10260)
- [CNA](https://github.com/parse-community/parse-server/commit/060d27053fb0fadf613c25aabab7fe0c82b7a899)
- [CNA](https://github.com/parse-community/parse-server/commit/2126fe4e12f9b399dc6b4b6a3fa70cb1825f159b)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.34%
- **EPSS Percentile:** 27.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._