CVE-2026-33508 | THREATINT

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.

PUBLISHED Reserved 2026-03-20 | Published 2026-03-24 | Updated 2026-03-25 | Assigner GitHub_M

HIGH: 8.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-674: Uncontrolled Recursion

Product status

< 8.6.56

affected

>= 9.0.0, < 9.6.0-alpha.45

affected

References

github.com/...server/security/advisories/GHSA-6qh5-m6g3-xhq6

github.com/parse-community/parse-server/pull/10259

github.com/parse-community/parse-server/pull/10260

github.com/...ommit/060d27053fb0fadf613c25aabab7fe0c82b7a899

github.com/...ommit/2126fe4e12f9b399dc6b4b6a3fa70cb1825f159b

cve.org (CVE-2026-33508)

nvd.nist.gov (CVE-2026-33508)

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