CVE-2026-33508
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductParseplatform Parse-server
PublishedMar 24, 2026
First seenMar 24, 2026
Weakness typeCWE-674CWE-674
How to fix
Update
- parseplatform parse-server8.6.56, 9.6.0 or later
- parse-server9.6.0-alpha.45, 8.6.56 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| parseplatform parse-server | v < 8.6.56, 9.0.0 ≤ v < 9.6.0, 9.6.0 | 8.6.56, 9.6.0 |
| parse-servernpm | 9.0.0 ≤ v < 9.6.0-alpha.45, v < 8.6.56 | 9.6.0-alpha.45, 8.6.56 |
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