Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M
CVE-2026-33508Parse Server: LiveQuery subscription query depth bypass
High 8.2
In plain English
A high-severity security flaw in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | parse-server | 9.6.0-alpha.45 | GHSA-6qh5-m6g3-xhq6 |
| npm | parse-server | 8.6.56 | GHSA-6qh5-m6g3-xhq6 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| parse-community | parse-server | < 8.6.56>= 9.0.0, < 9.6.0-alpha.45 |
Weakness: CWE-674 · Vector: 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
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-6qh5-m6g3-xhq6 x_refsource_CONFIRM
- https://github.com/parse-community/parse-server/pull/10259 x_refsource_MISC
- https://github.com/parse-community/parse-server/pull/10260 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/060d27053fb0fadf613c25aabab7fe0c82b7a899 x_refsource_MISC
- https://github.com/parse-community/parse-server/commit/2126fe4e12f9b399dc6b4b6a3fa70cb1825f159b x_refsource_MISC