Heap out-of-bounds read via unbounded prefix length
Published Jul 3, 2026 · Updated Jul 3, 2026
Heap out-of-bounds read in Net::IP::LPM 1.10 and earlier allows remote attackers to interrupt Perl processes via oversized prefixes. The add() method forwards an unchecked prefix length to addPrefixToTrie(), which walks beyond the 4-byte IPv4 or 16-byte IPv6 packed-address buffer. Reachability requires attacker-controlled prefix input to reach add(); hardened allocators can abort the process, and module lookups do not expose the over-read bytes.
Summary
What happened
Heap out-of-bounds read in Net::IP::LPM 1.10 and earlier allows remote attackers to interrupt Perl processes via oversized prefixes. The add() method forwards an unchecked prefix length to addPrefixToTrie(), which walks beyond the 4-byte IPv4 or 16-byte IPv6 packed-address buffer. Reachability requires attacker-controlled prefix input to reach add(); hardened allocators can abort the process, and module lookups do not expose the over-read bytes.
The record
- CVE
- CVE-2026-56015
- Published
- Jul 3, 2026
- Updated
- Jul 3, 2026
- Vendor
- Tomas Podermanski
- Product
- Net::IP::LPM
- Classifications
- CWE-125, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 3, 2026CVE publishedPublication date reported by the CVE source.
- Jul 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <=1.10
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
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Your stack
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