parse-community/parse-server · Security
Parse Server LiveQuery subscription query depth bypass
- GHSA ID
- GHSA-6qh5-m6g3-xhq6
- CVE ID
- CVE-2026-33508
- Severity
- high
- Published
- Updated
- CVSS
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS v3
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS v4
- 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
Description
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.
CWEs
- CWE-674 · Uncontrolled Recursion
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-6qh5-m6g3-xhq6 ↗
- https://github.com/parse-community/parse-server/pull/10259 ↗
- https://github.com/parse-community/parse-server/pull/10260 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-33508 ↗
- https://github.com/parse-community/parse-server/commit/060d27053fb0fadf613c25aabab7fe0c82b7a899 ↗
- https://github.com/parse-community/parse-server/commit/2126fe4e12f9b399dc6b4b6a3fa70cb1825f159b ↗
- https://github.com/advisories/GHSA-6qh5-m6g3-xhq6 ↗