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CVE-2026-49940— Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks

Quick assessment

Affected
RRWO Net::CIDR::Set
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Net::CIDR::Set是RRWO个人开发者的一个Perl网络地址管理库。 Net::CIDR::Set 0.20及之前版本存在安全漏洞，该漏洞源于接受非ASCII IP地址和网络掩码，Unicode数字如阿拉伯-印度一被接受但未正确解析为数字，可能导致网络掩码接受更大的网络。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
RRWO Net::CIDR::Set ≤ 0.20 affected
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I. Basic Information for CVE-2026-49940

Vulnerability Information
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Vulnerability Title
Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks
Source: CVE Program / CVE List V5
Vulnerability Description
Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks. Unicode digits such as the Arabic-Indic One (U+0661) were accepted but not properly parsed as numbers. This could allow network masks to accept larger networks.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1289
Source: CVE Program / CVE List V5
Vulnerability Title
Net::CIDR::Set 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Net::CIDR::Set是RRWO个人开发者的一个Perl网络地址管理库。 Net::CIDR::Set 0.20及之前版本存在安全漏洞，该漏洞源于接受非ASCII IP地址和网络掩码，Unicode数字如阿拉伯-印度一被接受但未正确解析为数字，可能导致网络掩码接受更大的网络。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
RRWO Net::CIDR::Set 0 ~ 0.20 -

II. Public POCs for CVE-2026-49940

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III. Intelligence Information for CVE-2026-49940

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Vendor Advisories for CVE-2026-49940 (1)

Vendor Pages for CVE-2026-49940 (1)

Same Patch Batch · RRWO · 2026-06-04 · 3 CVEs total

CVE-2026-49942 Net::CIDR::Set versions through 0.20 for Perl did not validate network masks
CVE-2026-49941 Net::CIDR::Set versions through 0.20 for Perl did not validate IP addresses

IV. Related Vulnerabilities

Same product: Net::CIDR::Set
Same vendor: RRWO
Same weakness: CWE-1289

V. Comments for CVE-2026-49940

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