High 8.2Published Mar 31, 2026

CVE-2026-34573Parse Server: GraphQL complexity validator exponential fragment traversal DoS

Updated under an hour ago (Oct 26, 2026, 10:50 PM 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 versions 8.6.68 and 9.7.0-alpha.12, the GraphQL query complexity validator can be exploited to cause a denial-of-service by sending a crafted query with binary fan-out fragment spreads. A single unauthenticated request can block the Node.js event loop for seconds, denying service to all concurrent users. This only affects deployments that have enabled the requestComplexity.graphQLDepth or requestComplexity.graphQLFields configuration options. This issue has been patched in versions 8.6.68 and 9.7.0-alpha.12.

CVSS: 8.2 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-407
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 31, 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 8.6.68; from 9.0.0, < 9.7.0-alpha.12	CNA record
parseplatform parse-server parseplatform:parse-server	before 8.6.68; from 9.0.0 before 9.7.0; 9.7.0; 9.7.0; 9.7.0; 9.7.0; 9.7.0; 9.7.0; and 5 more ranges	NVD

References

References

https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c	x-refsource-confirm, patch, vendor-advisory
https://github.com/parse-community/parse-server/pull/10344	x-refsource-misc, issue-tracking, patch
https://github.com/parse-community/parse-server/pull/10345	x-refsource-misc, issue-tracking, patch
https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295	x-refsource-misc, patch
https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b	x-refsource-misc, patch

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.