Parse Server affected by Regular Expression Denial of Service (ReDoS) via `$regex` query in LiveQuery
Priority MEDIUM 42CWE-1333Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00496 42nd percentileScored 2026-11-07
Fix Fixed parse-server (parse-community): 8.6.11parse-server (npm): 9.5.0-alpha.14, 8.6.11
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| parse-community | parse-server | >= 9.0.0 < 9.5.0-alpha.14; before 8.6.11 | 8.6.11 | Patch available | CNA |
| — | parse-server (npm) | 9.0.0-alpha.1 to before 9.5.0-alpha.14 | 9.5.0-alpha.14 | Patch available | GHSA-mf3j-86qx-cq5j |
| — | parse-server (npm) | before 8.6.11 | 8.6.11 | Patch available | GHSA-mf3j-86qx-cq5j |
- parse-server Vendorparse-community Affected >= 9.0.0 < 9.5.0-alpha.14; before 8.6.11 Fixed in 8.6.11 Patch available CNA
- parse-server (npm) Vendor— Affected 9.0.0-alpha.1 to before 9.5.0-alpha.14 Fixed in 9.5.0-alpha.14 Patch available GHSA-mf3j-86qx-cq5j
- parse-server (npm) Vendor— Affected before 8.6.11 Fixed in 8.6.11 Patch available GHSA-mf3j-86qx-cq5j
CPE configurations NVD · 14
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* | before 8.6.11; 9.0.0 to before 9.5.0 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha1:*:*:*:node.js:*:* | 9.5.0 alpha1 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha10:*:*:*:node.js:*:* | 9.5.0 alpha10 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha11:*:*:*:node.js:*:* | 9.5.0 alpha11 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha12:*:*:*:node.js:*:* | 9.5.0 alpha12 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha13:*:*:*:node.js:*:* | 9.5.0 alpha13 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha2:*:*:*:node.js:*:* | 9.5.0 alpha2 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha3:*:*:*:node.js:*:* | 9.5.0 alpha3 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha4:*:*:*:node.js:*:* | 9.5.0 alpha4 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha5:*:*:*:node.js:*:* | 9.5.0 alpha5 | Vulnerable | parse-community |
- cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* Versions before 8.6.11; 9.0.0 to before 9.5.0 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha1:*:*:*:node.js:*:* Versions 9.5.0 alpha1 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha10:*:*:*:node.js:*:* Versions 9.5.0 alpha10 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha11:*:*:*:node.js:*:* Versions 9.5.0 alpha11 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha12:*:*:*:node.js:*:* Versions 9.5.0 alpha12 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha13:*:*:*:node.js:*:* Versions 9.5.0 alpha13 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha2:*:*:*:node.js:*:* Versions 9.5.0 alpha2 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha3:*:*:*:node.js:*:* Versions 9.5.0 alpha3 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha4:*:*:*:node.js:*:* Versions 9.5.0 alpha4 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha5:*:*:*:node.js:*:* Versions 9.5.0 alpha5 Vulnerable ·parse-community
Show 4 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha6:*:*:*:node.js:*:* | 9.5.0 alpha6 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha7:*:*:*:node.js:*:* | 9.5.0 alpha7 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha8:*:*:*:node.js:*:* | 9.5.0 alpha8 | Vulnerable | parse-community |
| cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha9:*:*:*:node.js:*:* | 9.5.0 alpha9 | Vulnerable | parse-community |
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha6:*:*:*:node.js:*:* Versions 9.5.0 alpha6 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha7:*:*:*:node.js:*:* Versions 9.5.0 alpha7 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha8:*:*:*:node.js:*:* Versions 9.5.0 alpha8 Vulnerable ·parse-community
- cpe:2.3:a:parseplatform:parse-server:9.5.0:alpha9:*:*:*:node.js:*:* Versions 9.5.0 alpha9 Vulnerable ·parse-community
Remediation
- Fix · CNA parse-server (parse-community) Fixed in 8.6.11
- Fix · GHSA-mf3j-86qx-cq5j parse-server (npm) Fixed in 9.5.0-alpha.14 Advisory →
- Fix · GHSA-mf3j-86qx-cq5j parse-server (npm) Fixed in 8.6.11 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-30925
- 2026-10-03 Alias added: GHSA-mf3j-86qx-cq5j
References
More parse-community Parse-server vulnerabilities
- TI-2022-08574 Command Injection in Parse server CVSS 3.1CRITICAL 10.0
- TI-2024-18136 Parse Server literalizeRegexPart SQL Injection CVSS 3.1CRITICAL 10.0
- TI-2022-18768 Parse Server vulnerable to Remote Code Execution via prototype pollution in MongoDB BSON parser CVSS 3.1CRITICAL 9.8
- TI-2024-31550 Parse Server's custom object ID allows to acquire role privileges CVSS 3.1HIGH 8.1
- TI-2023-18316 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution CVSS 3.1CRITICAL 9.8
- TI-2026-23790 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter CVSS 4.0CRITICAL 9.9
Sources
- CVE-2026-30925 · CVE Program
- CVE-2026-30925 · NVD
- FIRST EPSS
- GHSA-mf3j-86qx-cq5j · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences