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.
References7
- github.com/regru/Net-Whois-Raw/issues/34
- github.com/regru/Net-Whois-Raw/pull/35
- metacpan.org/release/NALOBIN/Net-Whois-Raw-2.99044/changes
- metacpan.org/release/PJCJ/Net-IDN-Encode-2.590-TRIAL/view/lib/N…
- security.metacpan.org/patches/N/Net-Whois-Raw/2.99043/CVE-2026-…
- www.rfc-editor.org/rfc/rfc5891#section-5.2
- www.openwall.com/lists/oss-security/2026/10/05/9
Metrics
- CVSS 3.1
-
5.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 14 · as of 10 November 2026
- CWE
- CWE-176
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