CVE-2026-33508
HIGHParse Server: LiveQuery subscription query depth bypass
Title source: cnaDescription
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.
References (5)
Core 5
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/parse-community/parse-server/security/advisories/GHSA-6qh5-m6g3-xhq6
X_Refsource_Misc x_refsource_misc
https://github.com/parse-community/parse-server/pull/10259
X_Refsource_Misc x_refsource_misc
https://github.com/parse-community/parse-server/pull/10260
X_Refsource_Misc x_refsource_misc
https://github.com/parse-community/parse-server/commit/060d27053fb0fadf613c25aabab7fe0c82b7a899
X_Refsource_Misc x_refsource_misc
https://github.com/parse-community/parse-server/commit/2126fe4e12f9b399dc6b4b6a3fa70cb1825f159b
Scores
CVSS v3
7.5
EPSS
0.0034
EPSS Percentile
26.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-674
Status
published
Products (5)
npm/parse-server
9.0.0 - 9.6.0-alpha.45npm
parse-community/parse-server
< 8.6.56
parse-community/parse-server
>= 9.0.0, < 9.6.0-alpha.45
parseplatform/parse-server
9.6.0 alpha1 (44 CPE variants)
parseplatform/parse-server
< 8.6.56
Published
Mar 24, 2026
Tracked Since
Mar 25, 2026