High 8.8Published Mar 10, 2026

CVE-2026-30939Parse Server has Denial of Service (DoS) and Cloud Function Dispatch Bypass via Prototype Chain Resolution

Updated under an hour ago (Oct 28, 2026, 3:23 AM ET)

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It affects parse-community parse-server and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for parse-community parse-server

Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-1321
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

parse-community parse-server parse_community:parse_server (from the name)	before 8.6.13; from 9.0.0 < 9.5.1-alpha.2	CNA record
parseplatform parse-server parseplatform:parse-server	before 8.6.13; from 9.0.0 before 9.5.1; 9.5.1	NVD

References

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-5j86-7r7m-p8h6	x-refsource-confirm, mitigation, patch, vendor-advisory
https://github.com/parse-community/parse-server/releases/tag/8.6.13	x-refsource-misc, product, release-notes
https://github.com/parse-community/parse-server/releases/tag/9.5.1-alpha.2	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.