{"id":"UBUNTU-CVE-2026-45191","details":"Net::CIDR::Lite versions before 0.24 for Perl does not properly consider extraneous zero characters in CIDR mask values, which may allow IP ACL bypass. Mask forms like \"/00\" and \"/01\" pass validation and parse to the same prefix as their unpadded value. See also CVE-2026-45190.","modified":"2026-06-24T11:01:43.160375410Z","published":"2026-06-15T00:00:00Z","related":["USN-8453-1"],"upstream":["CVE-2026-45191"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-45191"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-45191"},{"type":"REPORT","url":"https://github.com/stigtsp/Net-CIDR-Lite/commit/24e2c439ec405e5256024b9acefd4f7008c5ed0c"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2026/05/10/7"},{"type":"REPORT","url":"https://lists.security.metacpan.org/cve-announce/msg/39920370/"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8453-1"}],"affected":[{"package":{"name":"libnet-cidr-lite-perl","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-lite-perl?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.21-1ubuntu0.16.04.1~esm2"}]}],"versions":["0.21-1","0.21-1ubuntu0.16.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.21-1ubuntu0.16.04.1~esm2","binary_name":"libnet-cidr-lite-perl"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45191.json"}},{"package":{"name":"libnet-cidr-lite-perl","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-lite-perl?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.21-1ubuntu0.18.04.1~esm2"}]}],"versions":["0.21-1","0.21-1ubuntu0.18.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnet-cidr-lite-perl","binary_version":"0.21-1ubuntu0.18.04.1~esm2"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45191.json"}},{"package":{"name":"libnet-cidr-lite-perl","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-lite-perl?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.21-2ubuntu0.1+esm2"}]}],"versions":["0.21-2","0.21-2ubuntu0.1","0.21-2ubuntu0.1+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_version":"0.21-2ubuntu0.1+esm2","binary_name":"libnet-cidr-lite-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45191.json"}},{"package":{"name":"libnet-cidr-lite-perl","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-lite-perl?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22-1ubuntu0.2"}]}],"versions":["0.22-1","0.22-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnet-cidr-lite-perl","binary_version":"0.22-1ubuntu0.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45191.json"}},{"package":{"name":"libnet-cidr-lite-perl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-lite-perl?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22-2ubuntu0.24.04.2"}]}],"versions":["0.22-2","0.22-2ubuntu0.24.04.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libnet-cidr-lite-perl","binary_version":"0.22-2ubuntu0.24.04.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45191.json"}},{"package":{"name":"libnet-cidr-lite-perl","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/libnet-cidr-lite-perl?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22-2ubuntu0.25.10.2"}]}],"versions":["0.22-2","0.22-2ubuntu0.25.10.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnet-cidr-lite-perl","binary_version":"0.22-2ubuntu0.25.10.2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45191.json"}},{"package":{"name":"libnet-cidr-lite-perl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libnet-cidr-lite-perl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22-2ubuntu0.26.04.2"}]}],"versions":["0.22-2","0.22-2ubuntu0.26.04.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"0.22-2ubuntu0.26.04.2","binary_name":"libnet-cidr-lite-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-45191.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L"},{"type":"Ubuntu","score":"medium"}]}