Unrated severityNVD Advisory· Published Oct 5, 2026
CVE-2026-19954
CVE-2026-19954
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <2.99044
Patches
Vulnerability mechanics
References
6- github.com/regru/Net-Whois-Raw/issues/34nvd
- github.com/regru/Net-Whois-Raw/pull/35nvd
- metacpan.org/release/NALOBIN/Net-Whois-Raw-2.99044/changesnvd
- metacpan.org/release/PJCJ/Net-IDN-Encode-2.590-TRIAL/view/lib/Net/IDN/Punycode.pmnvd
- security.metacpan.org/patches/N/Net-Whois-Raw/2.99043/CVE-2026-19954-r1.patchnvd
- www.rfc-editor.org/rfc/rfc5891nvd
News mentions
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