{"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 — 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 → createTerminal() (terminal.go:27-67) and POST /api/v1/file → 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"}}]}}