{"id":"UBUNTU-CVE-2026-71217","details":"A flaw was found in iperf3. A remote attacker can exploit this vulnerability by sending crafted control-channel JSON with oversized numeric parameters, such as `parallel` and `len`, which are not properly validated by the server. This improper input validation can lead to excessive stream and thread creation, as well as large buffer allocations, causing resource exhaustion. Consequently, this can result in a Denial of Service (DoS) on the affected iperf3 server.","modified":"2026-08-19T11:09:40Z","published":"2026-08-11T09:17:00Z","upstream":["CVE-2026-71217"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-71217"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-71217"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2460984"},{"type":"REPORT","url":"https://github.com/esnet/iperf/commit/494dd377eca4689672becdf06a85158557db1586"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-71217"}],"affected":[{"package":{"name":"iperf3","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.11-1","3.0.11-1ubuntu0.1~esm1","3.0.11-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"iperf3","binary_version":"3.0.11-1ubuntu0.1~esm2"},{"binary_name":"libiperf0","binary_version":"3.0.11-1ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71217.json"}},{"package":{"name":"iperf3","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1.3-1","3.1.3-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"iperf3","binary_version":"3.1.3-1ubuntu0.1~esm1"},{"binary_name":"libiperf0","binary_version":"3.1.3-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71217.json"}},{"package":{"name":"iperf3","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6-2","3.7-1","3.7-2","3.7-3","3.7-3ubuntu0.1~esm1","3.7-3ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"iperf3","binary_version":"3.7-3ubuntu0.1~esm2"},{"binary_name":"libiperf0","binary_version":"3.7-3ubuntu0.1~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71217.json"}},{"package":{"name":"iperf3","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9-1","3.9-1build1","3.9-1+deb11u1build0.22.04.1","3.9-1+deb11u1ubuntu0.1~esm1","3.9-1+deb11u1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"iperf3","binary_version":"3.9-1+deb11u1ubuntu0.1"},{"binary_version":"3.9-1+deb11u1ubuntu0.1","binary_name":"libiperf0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71217.json"}},{"package":{"name":"iperf3","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.14-1","3.15-1","3.16-1","3.16-1build1","3.16-1build2","3.16-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.16-1ubuntu0.1~esm1","binary_name":"iperf3"},{"binary_name":"libiperf0","binary_version":"3.16-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71217.json"}},{"package":{"name":"iperf3","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/iperf3?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.18-2","3.19.1-2","3.20-2"],"ecosystem_specific":{"binaries":[{"binary_name":"iperf3","binary_version":"3.20-2"},{"binary_version":"3.20-2","binary_name":"libiperf0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71217.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}