{"id":"CVE-2026-56015","state":"PUBLISHED","title":"Net::IP::LPM versions before 1.11 for Perl allow a heap out-of-bounds read via an unbounded prefix length","description":"Net::IP::LPM versions before 1.11 for Perl allow a heap out-of-bounds read via an unbounded prefix length.\n\nadd() passes the prefix string to the trie builder addPrefixToTrie() without checking it against the address width.\n\naddPrefixToTrie() then walks the prefix buffer by prefix_length bits, reading prefix[byte] for byte up to prefix_len/8, where prefix is the 4-byte (IPv4) or 16-byte (IPv6) packed address. A prefix length greater than 32 for IPv4 or 128 for IPv6, for example add(\"1.2.3.4/255\", $v) or add(\"2001:db8::/255\", $v), reads past the end of the packed address.\n\nThe out-of-bounds read happens during trie construction and is bounded: the prefix length is stored as an unsigned char, so the bit walk reads at most 32 bytes from the start of the packed address, a short distance past the end of the 4-byte or 16-byte buffer. It is detectable under AddressSanitizer, valgrind, or a hardened allocator, where it can abort the process. Lookups and dump() format only the valid address width, so the out-of-bounds bytes are not exposed through the module's API.","publishedAt":"2026-07-03T12:56:04.288Z","updatedAt":"2026-09-07T18:26:59.147Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","source":"CISA-ADP"},"assigner":"CPANSec","products":["Net-IP-LPM"],"affected":[{"packageName":"Net-IP-LPM","packageURL":"pkg:cpan/Net-IP-LPM","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.11","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","modules":["Net::IP::LPM"],"programFiles":["lib/Net/IP/LPM.pm","lpm_lib.c"],"programRoutines":[{"name":"Net::IP::LPM::add"},{"name":"addPrefixToTrie"},{"name":"lpm_add_raw"}]}],"references":["https://rt.cpan.org/Ticket/Display.html?id=179856","https://security.metacpan.org/patches/N/Net-IP-LPM/1.10/CVE-2026-56015-r2.patch","https://metacpan.org/release/RRWO/Net-IP-LPM-1.11/changes","http://www.openwall.com/lists/oss-security/2026/07/03/4"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/56xxx/CVE-2026-56015.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-56015","state":"PUBLISHED","datePublished":"2026-07-03T12:56:04.288Z","dateUpdated":"2026-09-07T18:26:59.147Z","assignerShortName":"CPANSec","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateReserved":"2026-06-18T11:27:09.117Z"},"containers":{"cna":{"title":"Net::IP::LPM versions before 1.11 for Perl allow a heap out-of-bounds read via an unbounded prefix length","descriptions":[{"lang":"en","value":"Net::IP::LPM versions before 1.11 for Perl allow a heap out-of-bounds read via an unbounded prefix length.\n\nadd() passes the prefix string to the trie builder addPrefixToTrie() without checking it against the address width.\n\naddPrefixToTrie() then walks the prefix buffer by prefix_length bits, reading prefix[byte] for byte up to prefix_len/8, where prefix is the 4-byte (IPv4) or 16-byte (IPv6) packed address. A prefix length greater than 32 for IPv4 or 128 for IPv6, for example add(\"1.2.3.4/255\", $v) or add(\"2001:db8::/255\", $v), reads past the end of the packed address.\n\nThe out-of-bounds read happens during trie construction and is bounded: the prefix length is stored as an unsigned char, so the bit walk reads at most 32 bytes from the start of the packed address, a short distance past the end of the 4-byte or 16-byte buffer. It is detectable under AddressSanitizer, valgrind, or a hardened allocator, where it can abort the process. Lookups and dump() format only the valid address width, so the out-of-bounds bytes are not exposed through the module's API."}],"affected":[{"packageName":"Net-IP-LPM","packageURL":"pkg:cpan/Net-IP-LPM","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.11","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","modules":["Net::IP::LPM"],"programFiles":["lib/Net/IP/LPM.pm","lpm_lib.c"],"programRoutines":[{"name":"Net::IP::LPM::add"},{"name":"addPrefixToTrie"},{"name":"lpm_add_raw"}]}],"references":[{"url":"https://rt.cpan.org/Ticket/Display.html?id=179856","tags":["issue-tracking","vendor-advisory"]},{"url":"https://security.metacpan.org/patches/N/Net-IP-LPM/1.10/CVE-2026-56015-r2.patch","tags":["patch"]},{"url":"https://metacpan.org/release/RRWO/Net-IP-LPM-1.11/changes","tags":["release-notes"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","description":"CWE-125 Out-of-bounds Read","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CPANSec","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateUpdated":"2026-09-07T18:26:59.147Z"},"source":{"discovery":"UNKNOWN"},"workarounds":[{"lang":"en","value":"Apply the patch.\n\nOtherwise, reject prefix lengths greater than 32 (IPv4) or 128 (IPv6) before passing them to add()."}],"x_generator":{"engine":"cpansec-cna-tool 0.1"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/07/03/4"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-07-03T16:31:29.386Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.1,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-06T18:35:54.436194Z","id":"CVE-2026-56015","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-06T18:36:22.103Z"}}]}}}