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CVE-2026-30925

HIGH CVSS 4.0: 8.2 EPSS 0.02%
Updated Mar 10, 2026
Parse
Parameter Value
CVSS 8.2 (HIGH)
Fixed In 9.5.0
Type CWE-1333 (Inefficient Regular Expression Complexity / ReDoS)
Vendor Parse
Public PoC No

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.0-alpha.14 and 8.6.11, a malicious client can subscribe to a LiveQuery with a crafted $regex pattern that causes catastrophic backtracking, blocking the Node.js event loop. This makes the entire Parse Server unresponsive, affecting all clients.

Any Parse Server deployment with LiveQuery enabled is affected. The attacker only needs the application ID and JavaScript key, both of which are public in client-side apps. This only affects LiveQuery subscription matching, which evaluates regex in JavaScript on the Node.js event loop.

Normal REST and GraphQL queries are not affected because their regex is evaluated by the database engine. This vulnerability is fixed in 9.5.0-alpha.14 and 8.6.11.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service

CVSS Vector v4.0

Weakness Type (CWE)

CWE-1333 Inefficient Regular Expression Complexity / ReDoS

References 3

https://github.com/parse-community/parse-server/releases/tag/8.6.11
security-advisories@github.com
https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.14
security-advisories@github.com
https://github.com/parse-community/parse-server/security/advisories/GHSA-mf3j-8…
security-advisories@github.com
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