CVE WatchOct 6, 2026

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

CVSS

5.4

Medium

EPSS

0.2%

p11

KEV

—

Exploit Today

0-100

Published: Oct 5, 2026 · Last modified: Oct 6, 2026 · CWE-176

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-10-052026-10-19

Technical 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.

Official references

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