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.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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| TPODER | Net::IP::LPM | unaffected |
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| Vendor | Product | Confidence | Versions | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Tpoder | Net::ip::lpm | 100% |
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Vendor Workaround
Apply the patch. Otherwise, reject prefix lengths greater than 32 (IPv4) or 128 (IPv6) before passing them to add().
Tracking
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Mon, 06 Jul 2026 23:15:00 +0000
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| First Time appeared |
Tpoder
Tpoder net::ip::lpm |
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| Vendors & Products |
Tpoder
Tpoder net::ip::lpm |
Mon, 06 Jul 2026 19:30:00 +0000
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cvssV3_1
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Fri, 03 Jul 2026 13:15:00 +0000
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| 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. | |
| Title | Net::IP::LPM versions through 1.10 for Perl allow a heap out-of-bounds read via an unbounded prefix length | |
| Weaknesses | CWE-125 | |
| References |
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MITRE
Status: PUBLISHED
Assigner: CPANSec
Published:
Updated: 2026-07-06T18:36:22.103Z
Reserved: 2026-06-18T11:27:09.117Z
Link: CVE-2026-56015
Vulnrichment
Updated: 2026-07-03T16:31:29.386Z
NVD
No data.
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-07-07T19:30:04Z