CVE-2026-30925

HIGH EPSS 35.6%
Published Mar 10, 20263mo ago · Modified Jun 17, 20262w ago
8.2 CVSS 4.0
High
Find Similar
Published Mar 10, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
8.2
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
35.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-1333

Affected Products 15

VendorProductVersionRange
parseplatformparse-server* <8.6.11
parseplatformparse-server*≥9.0.0  –  <9.5.0
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any
parseplatformparse-server9.5.0any

References 3

  • github.com https://github.com/parse-community/parse-server/releases/tag/8.6.11
    ProductRelease Notes
  • github.com https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.14
    ProductRelease Notes
  • github.com https://github.com/parse-community/parse-server/security/advisories/GHSA-mf3j-86qx-cq5j
    MitigationPatchVendor Advisory

Remediation

  • github.com https://github.com/parse-community/parse-server/security/advisories/GHSA-mf3j-86qx-cq5j
    MitigationPatchVendor Advisory