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

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。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.49% · P40

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-2026-49942

Vulnerability Information
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Vulnerability Title
Net::CIDR::Set versions through 0.20 for Perl did not validate network masks
Source: CVE Program / CVE List V5
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: 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

Vendor Product Affected Versions CPE Subscribe
RRWO Net::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-2026-49940 Net::CIDR::Set versions through 0.20 for Perl accept non-ASCII IP addresses and netmasks
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-2026-49942

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