Access-control bypass via decimal parsing of octal addresses
Published Jun 27, 2025 · Updated Sep 7, 2026
Improper IP validation in Net::IP::LPM 1.10 allows remote attackers to bypass IP-based access controls with leading-zero CIDRs. Its IPv4 parser accepts zero-prefixed octets as decimal text instead of rejecting them with inet_pton, so trie results can differ from system address resolution. Exploitation requires a consuming application to use attacker-controlled IP or CIDR text in an access-control decision.
Summary
What happened
Improper IP validation in Net::IP::LPM 1.10 allows remote attackers to bypass IP-based access controls with leading-zero CIDRs. Its IPv4 parser accepts zero-prefixed octets as decimal text instead of rejecting them with inet_pton, so trie results can differ from system address resolution. Exploitation requires a consuming application to use attacker-controlled IP or CIDR text in an access-control decision.
The record
- CVE
- CVE-2025-40910
- Published
- Jun 27, 2025
- Updated
- Sep 7, 2026
- Vendor
- Tomas Podermanski
- Product
- Net::IP::LPM
- Classifications
- CWE-1287
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 27, 2025CVE publishedPublication date reported by the CVE source.
- Sep 7, 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=1.10
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Technologies
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