Parse Server LiveQuery subscription query depth bypass
Impact
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.
Deployments are affected when the LiveQuery WebSocket endpoint is reachable by untrusted clients.
Patches
The fix adds query condition depth validation to the LiveQuery subscription handler, enforcing the same requestComplexity.queryDepth limit that already protects REST API queries.
Workarounds
There is no known workaround other than upgrading.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | parse-server | >= 9.0.0, < 9.6.0-alpha.45, < 8.6.56 | 9.6.0-alpha.45, 8.6.56 |
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-6qh5-m6g3-xhq6
- https://nvd.nist.gov/vuln/detail/CVE-2026-33508
- https://github.com/parse-community/parse-server/pull/10259
- https://github.com/parse-community/parse-server/pull/10260
- https://github.com/parse-community/parse-server/commit/060d27053fb0fadf613c25aabab7fe0c82b7a899
- https://github.com/parse-community/parse-server/commit/2126fe4e12f9b399dc6b4b6a3fa70cb1825f159b
- https://github.com/parse-community/parse-server
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-674- Platform
- npm
- Package
parse-server- Disclosed
- 20.03.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6qh5-m6g3-xhq6 - CC BY 4.0
Vulnerability history: parse-server
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 116
- First → latest
- 06.2019 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 17
- High 49
- Medium 40
- Low 10
Disclosures per year
- 2019: 2
- 2020: 4
- 2021: 4
- 2022: 12
- 2023: 5
- 2024: 4
- 2025: 6
- 2026: 79
-
Parse Server LiveQuery subscription query depth bypass this entry
Know which vulnerabilities affect your application
With the DockRay integration and software inventory enabled, DockRay checks reported component versions against known vulnerabilities and notifies you about confirmed matches. Coverage depends on the supported technology and available advisory data.