Vulnerability in Parse-Community Parse-Server
CVE-2026-33508
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 · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
- Parse-Community Parse-Server — versions < 8.6.56, >= 9.0.0, < 9.6.0-alpha.45
- Parseplatform Parse-Server — versions 9.6.0
Weakness classification (CWE)
References
- github.com/parse-community/parse-server/security/advisories/GHSA-6qh5-m6g3-xhq6 (Vendor Advisory)
- github.com/parse-community/parse-server/pull/10259 (Issue Tracking)
- github.com/parse-community/parse-server/pull/10260 (Issue Tracking)
- github.com/parse-community/parse-server/commit/060d27053fb0fadf613c25aabab7fe0c… (Patch)
- github.com/parse-community/parse-server/commit/2126fe4e12f9b399dc6b4b6a3fa70cb1… (Patch)
Frequently asked questions
- What is CVE-2026-33508?
- CVE-2026-33508 is a high-severity vulnerability in Parse-Community Parse-Server, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-03-24.
- How severe is CVE-2026-33508?
- High severity. CVSS v3 base score is 7.5 out of 10.