Net::IP::LPM versions through 1.10 for Perl allow a heap out-of-bounds read via an unbounded prefix length
Summary
| CVE | CVE-2026-56015 |
|---|---|
| State | PUBLISHED |
| Assigner | CPANSec |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-03 13:17:30 UTC |
| Updated | 2026-07-03 17:16:54 UTC |
| Description | Net::IP::LPM versions through 1.10 for Perl allow a heap out-of-bounds read via an unbounded prefix length. add() passes the prefix string to the trie builder addPrefixToTrie() without checking it against the address width. addPrefixToTrie() 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. The 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. |
Risk And Classification
Problem Types: CWE-125 | CWE-125 CWE-125 Out-of-bounds Read
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| rt.cpan.org/Ticket/Display.html | 9b29abf9-4ab0-4765-b253-1875cd9b441e | rt.cpan.org | |
| security.metacpan.org/patches/N/Net-IP-LPM/1.10/CVE-2026-56015-r2.patch | 9b29abf9-4ab0-4765-b253-1875cd9b441e | security.metacpan.org | |
| www.openwall.com/lists/oss-security/2026/07/03/4 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Additional Advisory Data
Workarounds
CNA: Apply the patch. Otherwise, reject prefix lengths greater than 32 (IPv4) or 128 (IPv6) before passing them to add().
There are currently no legacy QID mappings associated with this CVE.