{"id":"UBUNTU-CVE-2026-18726","details":"A flaw was found in open-iscsi. This vulnerability allows a remote attacker on the same local network segment to cause a Denial of Service (DoS) in the iscsiuio daemon. By sending a specially crafted Internet Control Message Protocol version 6 (ICMPv6) Router Advertisement with a zero-length option, the attacker can trigger an infinite loop. This leads to sustained CPU usage, rendering the daemon unresponsive and impacting system availability. A secondary risk of out-of-bounds reads exists with a short IPv6 payload, though no memory corruption or data exposure has been confirmed.","modified":"2026-08-19T11:01:27Z","published":"2026-08-12T22:17:00Z","upstream":["CVE-2026-18726"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-18726"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-18726"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-18726"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2462331"}],"affected":[{"package":{"name":"open-iscsi","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/open-iscsi?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.873-3ubuntu7","2.0.873-3ubuntu8","2.0.873-3ubuntu9"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.873-3ubuntu9","binary_name":"open-iscsi"},{"binary_version":"2.0.873-3ubuntu9","binary_name":"open-iscsi-utils"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.json"}},{"package":{"name":"open-iscsi","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/open-iscsi?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.873-3ubuntu13","2.0.873+git0.3b4b4500-13ubuntu3","2.0.873+git0.3b4b4500-14ubuntu1","2.0.873+git0.3b4b4500-14ubuntu3","2.0.873+git0.3b4b4500-14ubuntu3.1","2.0.873+git0.3b4b4500-14ubuntu3.2","2.0.873+git0.3b4b4500-14ubuntu3.3","2.0.873+git0.3b4b4500-14ubuntu3.4","2.0.873+git0.3b4b4500-14ubuntu3.5","2.0.873+git0.3b4b4500-14ubuntu3.6","2.0.873+git0.3b4b4500-14ubuntu3.7","2.0.873+git0.3b4b4500-14ubuntu3.7+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.873+git0.3b4b4500-14ubuntu3.7+esm1","binary_name":"open-iscsi"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.json"}},{"package":{"name":"open-iscsi","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/open-iscsi?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.874-4ubuntu3","2.0.874-4ubuntu4","2.0.874-4ubuntu5","2.0.874-5ubuntu1","2.0.874-5ubuntu2","2.0.874-5ubuntu2.1","2.0.874-5ubuntu2.2","2.0.874-5ubuntu2.3","2.0.874-5ubuntu2.4","2.0.874-5ubuntu2.6","2.0.874-5ubuntu2.7","2.0.874-5ubuntu2.9","2.0.874-5ubuntu2.10","2.0.874-5ubuntu2.11","2.0.874-5ubuntu2.11+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"iscsiuio","binary_version":"2.0.874-5ubuntu2.11+esm1"},{"binary_name":"open-iscsi","binary_version":"2.0.874-5ubuntu2.11+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.json"}},{"package":{"name":"open-iscsi","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/open-iscsi?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.874-7.1ubuntu3","2.0.874-7.1ubuntu5","2.0.874-7.1ubuntu6","2.0.874-7.1ubuntu6.1","2.0.874-7.1ubuntu6.2","2.0.874-7.1ubuntu6.3","2.0.874-7.1ubuntu6.4","2.0.874-7.1ubuntu6.5"],"ecosystem_specific":{"binaries":[{"binary_name":"iscsiuio","binary_version":"2.0.874-7.1ubuntu6.5"},{"binary_name":"open-iscsi","binary_version":"2.0.874-7.1ubuntu6.5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.json"}},{"package":{"name":"open-iscsi","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/open-iscsi?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.4-0ubuntu1","2.1.4-0ubuntu2","2.1.4-0ubuntu3","2.1.4-0ubuntu4","2.1.5-1ubuntu1","2.1.5-1ubuntu1.1"],"ecosystem_specific":{"binaries":[{"binary_name":"iscsiuio","binary_version":"2.1.5-1ubuntu1.1"},{"binary_name":"libopeniscsiusr","binary_version":"2.1.5-1ubuntu1.1"},{"binary_name":"libopeniscsiusr0.2.0","binary_version":"2.1.5-1ubuntu1.1"},{"binary_version":"2.1.5-1ubuntu1.1","binary_name":"open-iscsi"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.json"}},{"package":{"name":"open-iscsi","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/open-iscsi?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.8-1ubuntu2","2.1.9-3ubuntu1","2.1.9-3ubuntu2","2.1.9-3ubuntu3","2.1.9-3ubuntu4","2.1.9-3ubuntu5.1","2.1.9-3ubuntu5.2","2.1.9-3ubuntu5.3","2.1.9-3ubuntu5.4"],"ecosystem_specific":{"binaries":[{"binary_name":"iscsiuio","binary_version":"2.1.9-3ubuntu5.4"},{"binary_name":"libopeniscsiusr","binary_version":"2.1.9-3ubuntu5.4"},{"binary_version":"2.1.9-3ubuntu5.4","binary_name":"open-iscsi"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.json"}},{"package":{"name":"open-iscsi","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/open-iscsi?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.11-1ubuntu3","2.1.11-3ubuntu1","2.1.11-3ubuntu2","2.1.11-3ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"iscsiuio","binary_version":"2.1.11-3ubuntu3"},{"binary_name":"libopeniscsiusr","binary_version":"2.1.11-3ubuntu3"},{"binary_version":"2.1.11-3ubuntu3","binary_name":"open-iscsi"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18726.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}