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

AI Predicted 5.3 Difficulty: Moderate EPSS 0.31% · P23

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
RRWONet::CIDR::Set≤ 0.20affected
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I. Basic Information for CVE-2026-49942

Vulnerability Information
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Vulnerability Title
Net::CIDR::Set versions through 0.20 for Perl did not validate network masks
Source: NVD (National Vulnerability Database)
Vulnerability Description
Net::CIDR::Set versions through 0.20 for Perl did not validate network masks. The mask portion of a network mask could contain Unicode digits such as the Arabic-Indic One (U+0661), or non-digits, which were ignored. This could allow network masks to accept larger networks. Leading zeros were also accepted, but treated as decimal instead of octal. This could lead to confusion about what networks are acceptable.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1289
Source: NVD (National Vulnerability Database)
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，该漏洞源于未验证网络掩码，网络掩码的掩码部分可能包含Unicode数字如阿拉伯-印度一或非数字字符并被忽略，可能导致网络掩码接受更大的网络，且前导零被接受但视为十进制而非八进制，可能导致网络接受混淆。
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

VendorProductAffected VersionsCPESubscribe
RRWONet::CIDR::Set 0 ~ 0.20 -

II. Public POCs for CVE-2026-49942

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III. Intelligence Information for CVE-2026-49942

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Vendor Advisories for CVE-2026-49942 (2)

Vendor Pages for CVE-2026-49942 (1)

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

CVE-2026-49940Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks
CVE-2026-49941Net::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-2026-49942

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