CVE-2026-49940Network attack vector

Network-range expansion via Unicode digit parsing

Published Jun 4, 2026 · Updated Jun 4, 2026

Improper digit validation in Net::CIDR::Set 0.20 and earlier allows remote attackers to expand IP ranges via non-ASCII addresses or masks. The IPv4::_pack, IPv4::_encode, IPv6::_pack, and IPv6::_pack_ipv4 routines accept Unicode digits before numeric conversion that does not preserve their values. Exposure requires a consuming Perl application to pass attacker-controlled address or netmask text, allowing unintended addresses into a calculated range.

CVSS severity6.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper digit validation in Net::CIDR::Set 0.20 and earlier allows remote attackers to expand IP ranges via non-ASCII addresses or masks. The IPv4::_pack, IPv4::_encode, IPv6::_pack, and IPv6::_pack_ipv4 routines accept Unicode digits before numeric conversion that does not preserve their values. Exposure requires a consuming Perl application to pass attacker-controlled address or netmask text, allowing unintended addresses into a calculated range.

The record

CVE
CVE-2026-49940
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Robert Rothenberg
Product
Net::CIDR::Set
Classifications
CWE-1289
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 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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  1. Affected versionversion=0 <=0.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Robert Rothenberg · Net::CIDR::Setversion=0 <=0.20

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1289Improper Validation of Unsafe Equivalence in Input

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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