{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "nezha",
          "vendor": "nezhahq",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.0.0, \u003c 2.2.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O\u0026M 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."
        }
      ],
      "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-12T21:04:38.357Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "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"
        }
      ],
      "source": {
        "advisory": "GHSA-jg62-j5h6-8mpq",
        "discovery": "UNKNOWN"
      },
      "title": "Nezha Monitoring: Unbounded WebSocket Streams \u2014 Resource Exhaustion DoS"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-53522",
    "datePublished": "2026-06-12T21:04:38.357Z",
    "dateReserved": "2026-06-09T17:30:33.456Z",
    "dateUpdated": "2026-06-12T21:04:38.357Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53522",
      "date": "2026-06-14",
      "epss": "0.0004",
      "percentile": "0.12375"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53522\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-06-12T22:16:52.377\",\"lastModified\":\"2026-06-12T22:16:52.377\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O\u0026M 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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-770\"}]}],\"references\":[{\"url\":\"https://github.com/nezhahq/nezha/security/advisories/GHSA-jg62-j5h6-8mpq\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}