{"id":"ALPINE-CVE-2026-40198","details":"Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass.\n\n_pack_ipv6() does not check that uncompressed IPv6 addresses (without ::) have exactly 8 hex groups. Inputs like \"abcd\", \"1:2:3\", or \"1:2:3:4:5:6:7\" are accepted and produce packed values of wrong length (3, 7, or 15 bytes instead of 17).\n\nThe packed values are used internally for mask and comparison operations. find() and bin_find() use Perl string comparison (lt/gt) on these values, and comparing strings of different lengths gives wrong results. This can cause find() to incorrectly report an address as inside or outside a range.\n\nExample:\n\n  my $cidr = Net::CIDR::Lite-\u003enew(\"::/8\");\n  $cidr-\u003efind(\"1:2:3\");  # invalid input, incorrectly returns true\n\nThis is the same class of input validation issue as CVE-2021-47154 (IPv4 leading zeros) previously fixed in this module.\n\nSee also CVE-2026-40199, a related issue in the same function affecting IPv4 mapped IPv6 addresses.","modified":"2026-04-12T18:27:28.091060Z","published":"2026-04-10T22:16:21.463Z","upstream":["CVE-2026-40198"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2026-40198"}],"affected":[{"package":{"name":"perl-net-cidr-lite","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/perl-net-cidr-lite?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.23-r0"}]}],"versions":["0.22-r2"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-40198.json"}},{"package":{"name":"perl-net-cidr-lite","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/perl-net-cidr-lite?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.23-r0"}]}],"versions":["0.22-r2"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-40198.json"}},{"package":{"name":"perl-net-cidr-lite","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/perl-net-cidr-lite?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.23-r0"}]}],"versions":["0.22-r2"],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2026-40198.json"}}],"schema_version":"1.7.5"}