{"id":"CVE-2026-102253","summary":"iperf3 \u003c 3.22 UDP Receive Worker Infinite Loop DoS","details":"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.","modified":"2026-10-02T11:45:48.274671277Z","published":"2026-09-29T20:11:47.089Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-835"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102253.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102253.json"},{"type":"ADVISORY","url":"https://github.com/esnet/iperf/blob/master/RELNOTES.md"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102253"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/iperf3-udp-receive-worker-infinite-loop-dos"},{"type":"FIX","url":"https://github.com/esnet/iperf/releases/tag/3.22"},{"type":"PACKAGE","url":"https://github.com/esnet/iperf"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/esnet/iperf","events":[{"introduced":"a0be85934144bc04712a6695b14ea6e45c379e1d"},{"fixed":"926bd905501b792bd082d2200d1d1a84aa543e3a"}],"database_specific":{"extracted_events":[{"introduced":"3.14"},{"fixed":"3.22"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"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/osv-test-cve-osv-conversion/osv-output/CVE-2026-102253.json"}}],"schema_version":"1.9.0","severity":[{"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"}]}