{"api_version":"1","generated_at":"2026-04-11T03:23:58+00:00","cve":"CVE-2026-40198","urls":{"html":"https://cve.report/CVE-2026-40198","api":"https://cve.report/api/cve/CVE-2026-40198.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-40198","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-40198"},"summary":{"title":"Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass","description":"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->new(\"::/8\");\n  $cidr->find(\"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.","state":"PUBLISHED","assigner":"CPANSec","published_at":"2026-04-10 22:16:21","updated_at":"2026-04-10 22:16:21"},"problem_types":["CWE-1286","CWE-1286 CWE-1286 Improper Validation of Syntactic Correctness of Input"],"metrics":[],"references":[{"url":"https://github.com/stigtsp/Net-CIDR-Lite/commit/25d65f85dbe4885959a10471725ec9d250a589c3.patch","name":"https://github.com/stigtsp/Net-CIDR-Lite/commit/25d65f85dbe4885959a10471725ec9d250a589c3.patch","refsource":"9b29abf9-4ab0-4765-b253-1875cd9b441e","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-40199","name":"https://www.cve.org/CVERecord?id=CVE-2026-40199","refsource":"9b29abf9-4ab0-4765-b253-1875cd9b441e","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.23/changes","name":"https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.23/changes","refsource":"9b29abf9-4ab0-4765-b253-1875cd9b441e","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-40198","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40198","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"STIGTSP","product":"Net::CIDR::Lite","version":"affected 0.23 custom","platforms":[]}],"timeline":[{"source":"CNA","time":"2026-04-09T00:00:00.000Z","lang":"en","value":"Vulnerability found"},{"source":"CNA","time":"2026-04-10T00:00:00.000Z","lang":"en","value":"Net-CIDR-Lite version 0.23 released"}],"solutions":[{"source":"CNA","title":"","value":"Upgrade to version 0.23 or newer, or apply the patch provided.","time":"","lang":"en"}],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","packageName":"Net-CIDR-Lite","product":"Net::CIDR::Lite","programFiles":["Lite.pm"],"programRoutines":[{"name":"Net::CIDR::Lite::_pack_ipv6"}],"repo":"https://github.com/stigtsp/Net-CIDR-Lite","vendor":"STIGTSP","versions":[{"lessThan":"0.23","status":"affected","version":"0","versionType":"custom"}]}],"descriptions":[{"lang":"en","value":"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->new(\"::/8\");\n  $cidr->find(\"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."}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1286","description":"CWE-1286 Improper Validation of Syntactic Correctness of Input","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-04-10T21:42:06.835Z","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","shortName":"CPANSec"},"references":[{"tags":["patch"],"url":"https://github.com/stigtsp/Net-CIDR-Lite/commit/25d65f85dbe4885959a10471725ec9d250a589c3.patch"},{"tags":["release-notes"],"url":"https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.23/changes"},{"tags":["related"],"url":"https://www.cve.org/CVERecord?id=CVE-2026-40199"}],"solutions":[{"lang":"en","value":"Upgrade to version 0.23 or newer, or apply the patch provided."}],"source":{"discovery":"UNKNOWN"},"timeline":[{"lang":"en","time":"2026-04-09T00:00:00.000Z","value":"Vulnerability found"},{"lang":"en","time":"2026-04-10T00:00:00.000Z","value":"Net-CIDR-Lite version 0.23 released"}],"title":"Net::CIDR::Lite versions before 0.23 for Perl does not validate IPv6 group count, which may allow IP ACL bypass","x_generator":{"engine":"cpansec-cna-tool 0.1"}}},"cveMetadata":{"assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","assignerShortName":"CPANSec","cveId":"CVE-2026-40198","datePublished":"2026-04-10T21:42:06.835Z","dateReserved":"2026-04-09T22:12:06.334Z","dateUpdated":"2026-04-10T21:42:06.835Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-04-10 22:16:21","lastModifiedDate":"2026-04-10 22:16:21","problem_types":["CWE-1286","CWE-1286 CWE-1286 Improper Validation of Syntactic Correctness of Input"],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"40198","Ordinal":"1","Title":"Net::CIDR::Lite versions before 0.23 for Perl does not validate ","CVE":"CVE-2026-40198","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"40198","Ordinal":"1","NoteData":"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->new(\"::/8\");\n  $cidr->find(\"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.","Type":"Description","Title":"Net::CIDR::Lite versions before 0.23 for Perl does not validate "}]}}}