{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-34573", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-30T16:56:30.998Z", "datePublished": "2026-03-31T15:06:33.372Z", "dateUpdated": "2026-03-31T18:52:50.211Z"}, "containers": {"cna": {"title": "Parse Server: GraphQL complexity validator exponential fragment traversal DoS", "problemTypes": [{"descriptions": [{"cweId": "CWE-407", "lang": "en", "description": "CWE-407: Inefficient Algorithmic Complexity", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "vectorString": "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", "version": "4.0"}}], "references": [{"name": "https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c"}, {"name": "https://github.com/parse-community/parse-server/pull/10344", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/pull/10344"}, {"name": "https://github.com/parse-community/parse-server/pull/10345", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/pull/10345"}, {"name": "https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295"}, {"name": "https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b", "tags": ["x_refsource_MISC"], "url": "https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b"}], "affected": [{"vendor": "parse-community", "product": "parse-server", "versions": [{"version": "< 8.6.68", "status": "affected"}, {"version": ">= 9.0.0, < 9.7.0-alpha.12", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-31T15:06:33.372Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-mfj6-6p54-m98c", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-03-31T18:50:19.982563Z", "id": "CVE-2026-34573", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-31T18:52:50.211Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-34573", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-31T18:50:19.982563Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-31T18:50:21.036Z"}}], "cna": {"title": "Parse Server: GraphQL complexity validator exponential fragment traversal DoS", "source": {"advisory": "GHSA-mfj6-6p54-m98c", "discovery": "UNKNOWN"}, "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 8.2, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "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", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE"}}], "affected": [{"vendor": "parse-community", "product": "parse-server", "versions": [{"status": "affected", "version": "< 8.6.68"}, {"status": "affected", "version": ">= 9.0.0, < 9.7.0-alpha.12"}]}], "references": [{"url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c", "name": "https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/parse-community/parse-server/pull/10344", "name": "https://github.com/parse-community/parse-server/pull/10344", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/parse-community/parse-server/pull/10345", "name": "https://github.com/parse-community/parse-server/pull/10345", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295", "name": "https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b", "name": "https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b", "tags": ["x_refsource_MISC"]}], "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-407", "description": "CWE-407: Inefficient Algorithmic Complexity"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-31T15:06:33.372Z"}}}, "cveMetadata": {"cveId": "CVE-2026-34573", "state": "PUBLISHED", "dateUpdated": "2026-03-31T18:52:50.211Z", "dateReserved": "2026-03-30T16:56:30.998Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-03-31T15:06:33.372Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-34573", "lastModified": "2026-03-31T16:16:33.737", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-03-31T16:16:33.737", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/parse-community/parse-server/commit/ea15412795f34594cc8a674fe858d445675e0295"}, {"source": "security-advisories@github.com", "url": "https://github.com/parse-community/parse-server/commit/f759bda075298ec44e2b4fb57659a0c56620483b"}, {"source": "security-advisories@github.com", "url": "https://github.com/parse-community/parse-server/pull/10344"}, {"source": "security-advisories@github.com", "url": "https://github.com/parse-community/parse-server/pull/10345"}, {"source": "security-advisories@github.com", "url": "https://github.com/parse-community/parse-server/security/advisories/GHSA-mfj6-6p54-m98c"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-407"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,8.6.68)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.0,9.7.0-alpha.12)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "parse-server", "source": "cna", "vendor": "parse-community"}, "product": "parse_server", "vendor": "parse_community"}], "analysis": {"en": {"generated_at": "2026-03-31T16:21:07.894876+00:00", "value": {"mitigation_remediation": ["Upgrade Parse Server to version 8.6.68 or later (or 9.7.0-alpha.12 or later) to apply the fix.", "If an immediate upgrade is not possible, disable the requestComplexity.graphQLDepth and requestComplexity.graphQLFields settings to prevent the vulnerability from being triggered.", "Verify that the configuration changes persist after deployment and that no malicious queries are processed.", "Monitor the application for abnormal CPU usage or event\u2011loop blocking events to detect any attempts to exploit the remaining risk before a patch is applied."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The issue affects deployments of parse\u2011community's Parse Server running on Node.js that have the requestComplexity.graphQLDepth or requestComplexity.graphQLFields options enabled. Versions prior to 8.6.68 on the stable branch and before 9.7.0\u2011alpha.12 on the development branch are impacted. Upgrading to the patched releases removes the vulnerability.", "description_and_impact": "The vulnerability allows an attacker to send a specially crafted GraphQL query that triggers an exponential traversal of fragment spreads in the complexity validator. This leads to prolonged blocking of the Node.js event loop, causing a denial\u2011of\u2011service for all users on the affected server. The weakness is a form of excessive resource consumption, identified as CWE\u2011407.", "risk_and_exploitability": "The CVSS score of 8.2 indicates high severity, with a single unauthenticated request capable of shutting down service for seconds. EPSS data is unavailable, but because the flaw requires only a crafted payload over the public GraphQL endpoint, the likelihood of exploitation is significant. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog, but any exposed Parse Server instance that has the complexity validator enabled is at risk for denial of service."}}}}, "created": "2026-03-31T19:54:15.475407+00:00", "updated": "2026-03-31T20:38:11.621421+00:00", "vendors": ["parse_community", "parse_community$PRODUCT$parse_server"]}