Inefficient regular expression complexity in Parse Server - CVE-2026-30925
Published: April 6, 2026
Vulnerability identifier: #VU124977
CSH Severity: Medium
CVSS v4.0: 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
CVE-ID: CVE-2026-30925
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Parse Community
Affected software:
Parse Server
Parse Server
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient regular expression complexity in LiveQuery subscription matching when processing a crafted $regex query. A remote attacker can subscribe to a LiveQuery with a crafted regular expression pattern to cause a denial of service.
Only deployments with LiveQuery enabled are vulnerable. Normal REST and GraphQL queries are not affected because their regular expressions are evaluated by the database engine.
How to mitigate CVE-2026-30925
Install security update from vendor's website.