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CVE-2026-19954— Net::Whois::Raw versions before 2.99044 for Perl ship a pwhois command-line tool that queries WHOIS for the wrong domain for unicode domain names

Quick assessment

Affected
CVE-2026-19954
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.

Perl 版本的 Net::Whois::Raw（2.99044 之前版本）包含一个名为 pwhois 的命令行工具，该工具在查询 Unicode 域名时存在错误，会针对错误的域名执行 WHOIS 查询。 pwhois 直接使用 Net::IDN::Punycode 对每个非 ASCII 标签进行编码，并在前面加上 "xn--" 前缀。除了将 ASCII 字母和西里尔字母转换为小写外，它跳过了 IDNA（基于国际域名）的映射和规范化步骤。因此，包含其他大写字符或未经 NFC（规范分解兼容性）格式化的标签，其编码结果

AI Predicted 5.3 Difficulty: Trivial

Possible ATT&CK Techniques 1 AI

T1592 · Gather Victim Host Information

I. Basic Information for CVE-2026-19954

Vulnerability Information
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Vulnerability Title
Net::Whois::Raw versions before 2.99044 for Perl ship a pwhois command-line tool that queries WHOIS for the wrong domain for unicode domain names
Source: CVE Program / CVE List V5
Vulnerability Description
Net::Whois::Raw versions before 2.99044 for Perl ship a pwhois command-line tool that queries WHOIS for the wrong domain for unicode domain names. pwhois encodes each non-ASCII label directly using Net::IDN::Punycode and prepends xn--. Apart from lowercasing ASCII and Cyrillic letters, it skips the IDNA mapping and normalization steps, so a label with other uppercase letters, or not in NFC, encodes to a different A-label than its IDNA form. For example, a label of U+00C9 followed by "cole" encodes to "xn--cole-pka" rather than "xn--cole-9oa". The Net::Whois::Raw library modules are not affected.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
Unicode编码处理不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 2.99044 -

II. Public POCs for CVE-2026-19954

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-19954

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Patches & Fixes for CVE-2026-19954 (1)

Vendor Advisories for CVE-2026-19954 (1)

Other References for CVE-2026-19954 (2)

IV. Related Vulnerabilities

Same weakness: CWE-176

V. Comments for CVE-2026-19954

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