Parse Server LiveQuery subscription query depth bypass

Description

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.

Recommendation

Update the parse-server package to the latest compatible version. Followings are version details:

• Affected version(s): **< 8.6.56

  >= 9.0.0, < 9.6.0-alpha.45**

• Patched version(s): **8.6.56

  9.6.0-alpha.45**

References

• GHSA-6qh5-m6g3-xhq6
• CVE-2026-33508
• CWE-674
• CAPEC-310
• OWASP 2021-A6

Related Issues

• Parse Server has a query condition depth bypass via pre-validation transform pipeline - CVE-2026-33498
• Parse Server has a protected fields bypass via LiveQuery subscription WHERE clause - CVE-2026-32098
• Parse Server has a protected fields bypass via logical query operators - CVE-2026-30962
• Parse Server has a protected fields bypass via dot-notation in query and sort - CVE-2026-31872

Tags:

npm

parse-server