{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-53522", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-09T17:30:33.456Z", "datePublished": "2026-06-12T21:04:38.357Z", "dateUpdated": "2026-06-15T19:27:20.840Z"}, "containers": {"cna": {"title": "Nezha Monitoring: Unbounded WebSocket Streams \u2014 Resource Exhaustion DoS", "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/nezhahq/nezha/security/advisories/GHSA-jg62-j5h6-8mpq", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/nezhahq/nezha/security/advisories/GHSA-jg62-j5h6-8mpq"}], "affected": [{"vendor": "nezhahq", "product": "nezha", "versions": [{"version": ">= 1.0.0, < 2.2.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-06-12T21:04:38.357Z"}, "descriptions": [{"lang": "en", "value": "Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.0.0 to before version 2.2.0, the Nezha dashboard exposes two endpoints that create long-lived WebSocket streams to monitored agents: POST /api/v1/terminal \u2192 createTerminal() (terminal.go:27-67) and POST /api/v1/file \u2192 createFM() (fm.go:28-67). Both call rpc.NezhaHandlerSingleton.CreateStream(streamId, ...) which inserts a new ioStreamContext into an unbounded map[string]*ioStreamContext (s.ioStreams in io_stream.go:59-67). There is no per-user rate limit, no global semaphore, and no per-server connection cap. This issue has been patched in version 2.2.0."}], "source": {"advisory": "GHSA-jg62-j5h6-8mpq", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/nezhahq/nezha/security/advisories/GHSA-jg62-j5h6-8mpq", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-15T17:03:17.090512Z", "id": "CVE-2026-53522", "options": [{"Exploitation": "poc"}, {"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": "2026-06-15T19:27:20.840Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 1.0.0 to before version 2.2.0, the Nezha dashboard exposes two endpoints that create long-lived WebSocket streams to monitored agents: POST /api/v1/terminal \u2192 createTerminal() (terminal.go:27-67) and POST /api/v1/file \u2192 createFM() (fm.go:28-67). Both call rpc.NezhaHandlerSingleton.CreateStream(streamId, ...) which inserts a new ioStreamContext into an unbounded map[string]*ioStreamContext (s.ioStreams in io_stream.go:59-67). There is no per-user rate limit, no global semaphore, and no per-server connection cap. This issue has been patched in version 2.2.0."}], "id": "CVE-2026-53522", "lastModified": "2026-06-15T21:17:25.123", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-06-12T22:16:52.377", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/nezhahq/nezha/security/advisories/GHSA-jg62-j5h6-8mpq"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/nezhahq/nezha/security/advisories/GHSA-jg62-j5h6-8mpq"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.0.0,2.2.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "nezha", "source": "cna", "vendor": "nezhahq"}, "product": "nezha", "vendor": "nezhahq"}], "created": "2026-06-12T22:30:08.132279+00:00", "updated": "2026-06-13T12:30:00.294154+00:00", "vendors": ["nezhahq", "nezhahq$PRODUCT$nezha"]}