Main Vulnerability Database SB2026040748

SB2026040748 - Uncontrolled Recursion in Parse Server

Published: April 7, 2026

Security Bulletin ID SB2026040748

CSH Severity

Medium

Patch available

YES

Number of vulnerabilities 1

Exploitation vector Remote access

Highest impact Denial of service

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 1 vulnerability.

1) Uncontrolled Recursion (CVE-ID: CVE-2026-33508)

CWE-ID: CWE-674 - Uncontrolled Recursion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled recursion in the LiveQuery subscription handler when processing WebSocket subscription requests with deeply nested logical operators. A remote attacker can send a specially crafted subscription request to cause a denial of service.

Deployments are affected when the LiveQuery WebSocket endpoint is reachable by untrusted clients.

Remediation

Install update from vendor's website.

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-6qh5-m6g3-xhq6