iperf3 < 3.22 UDP Receive Worker Infinite Loop DoS

{
  "id": "c5e85005f173665caef0b6179793a4bf60cad35ba5bf1908c7283155ed52bbd6",
  "url": "https://osv.dev/vulnerability/CVE-2026-102253",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iperf3 < 3.22 UDP Receive Worker Infinite Loop DoS",
    "summary": "iperf3 versions prior to 3.22 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash-loop the server's UDP receive worker into an unrecoverable infinite loop by sending a single crafted control-channel parameter message followed by one 16-byte UDP datagram. Attackers can permanently pin the affected per-stream receive thread at approximately 100% CPU usage, rendering the server unusable until forcibly killed with SIGKILL, as the process does not respond to normal control-channel closure.",
    "evidence": "osv:CVE-2026-102253",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-102253",
      "aliases": [
        "CVE-2026-102253"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/esnet/iperf",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a0be85934144bc04712a6695b14ea6e45c379e1d"
                },
                {
                  "fixed": "926bd905501b792bd082d2200d1d1a84aa543e3a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "3.14"
                      },
                      {
                        "fixed": "3.22"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "926bd905501b792bd082d2200d1d1a84aa543e3a"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "3.22"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.22"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "3.21",
            "3.20",
            "3.19",
            "3.18",
            "3.17.1",
            "3.16",
            "3.16-beta1",
            "3.15",
            "3.14"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-102253.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.370100720Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102253.json",
        "https://github.com/esnet/iperf/blob/master/RELNOTES.md",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-102253",
        "https://www.vulncheck.com/advisories/iperf3-udp-receive-worker-infinite-loop-dos",
        "https://github.com/esnet/iperf/releases/tag/3.22",
        "https://github.com/esnet/iperf"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-835"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102253.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-102253",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519000,
  "published_at": "2026-09-29T20:11:47.089+00:00"
}