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CVE

CVE-2026-30939

Parse Server has Denial of Service (DoS) and Cloud Function Dispatch Bypass via Prototype Chain Resolution
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CVE

CVE-2026-30939

Parse Server has Denial of Service (DoS) and Cloud Function Dispatch Bypass via Prototype Chain Resolution

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to 8.6.13 and 9.5.1-alpha.2, an unauthenticated attacker can crash the Parse Server process by calling a Cloud Function endpoint with a prototype property name as the function name. The server recurses infinitely, causing a call stack size error that terminates the process. Other prototype property names bypass Cloud Function dispatch validation and return HTTP 200 responses, even though no such Cloud Functions are defined. The same applies to dot-notation traversal. All Parse Server deployments that expose the Cloud Function endpoint are affected. This vulnerability is fixed in 8.6.13 and 9.5.1-alpha.2.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.8
-
4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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
C
H
U
0
-
C
H
U
8.2
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Related Resources

No items found.

References

https://github.com/parse-community/parse-server/releases/tag/8.6.13, https://github.com/parse-community/parse-server/releases/tag/9.5.1-alpha.2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30939.json, https://github.com/parse-community/parse-server/security/advisories/GHSA-5j86-7r7m-p8h6, https://nvd.nist.gov/vuln/detail/CVE-2026-30939

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.00181%
EPSS Percentile
0.39648%
Introduced Version
532a461d30a6ed4457839f2caf5f30d5abf51a55
Fix Available
f376abb60e38a7bce723163ec7ab4fb9697df79d

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