Home/CVE/Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.0-a
CVE

CVE-2026-30925

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 9.5.0-a

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.

HIGH · CVSS 7.5 EPSS 0.00021
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-1333Inefficient Regular Expression Complexity
▤

Affected Products & Versions

3
parseplatform parse-server< 8.6.11
parseplatform parse-server>= 9.0.0 and < 9.5.0
parseplatform parse-serverall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm parse-server HIGH fixed in 9.5.0-alpha.14
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD10 Mar 2026 · 05:40 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/parse-community/parse-server/releases/tag/8.6.11ProductRelease Notes
https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.14ProductRelease Notes
https://github.com/parse-community/parse-server/security/advisories/GHSA-mf3j-86qx-cq5jMitigationPatchVendor Advisory
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