Inefficient Algorithmic Complexity in Parse Server - CVE-2026-57480
Published: June 30, 2026
Vulnerability identifier: #VU135971
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-57480
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient algorithmic complexity in query handling when processing deeply nested query condition operators. A remote attacker can send a small crafted query to cause a denial of service.
The issue affects REST API and LiveQuery query handling and is reachable in the default configuration. No user authentication is required, and a single request can block the Node.js event loop for many seconds.
Affected software
Parse Server
How to mitigate CVE-2026-57480
Install security update from vendor's website.
Parse Server - addressed in versions 8.6.82, 9.9.1 alpha.12