{"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":"2026-10-02T03:47:17.728613177Z","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","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"3.14"},{"fixed":"3.22"}]},{"extracted_events":[{"introduced":"3.14"},{"fixed":"3.22"}],"source":"CPE_FIELD"}]},"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":"0"},{"fixed":"926bd905501b792bd082d2200d1d1a84aa543e3a"}],"database_specific":{"source":"REFERENCES"}}],"versions":["3.21","3.20","3.19","3.18","3.17.1","3.16","3.16-beta1","3.15","3.14","3.13","3.12","3.11","3.10.1","3.10","3.9","3.8.1","3.8","3.7","3.6","3.5","3.4","3.3","3.2","3.2rc1","3.1","3.1b3","3.1b2","3.1b1","3.0.4","3.0.1","3.0-BETA5","3.0-BETA4","3.0-BETA3","3.0-BETA2","3.0-BETA1","iperf3","3.0-ALPHA1","iperf-3.0a1","trunk","2.0.4-RELEASE","2.0.3-RELEASE","2.0.2-RELEASE","2.0.1-RELEASE","2.0-RELEASE"],"database_specific":{"source":"https://storage.googleapis.com/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"}]}