CVE-2026-19954
mediumNet::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.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/regru/Net-Whois-Raw/issues/34 9b29abf9-4ab0-4765-b253-1875cd9b441e
- https://github.com/regru/Net-Whois-Raw/pull/35 9b29abf9-4ab0-4765-b253-1875cd9b441e
- https://metacpan.org/release/NALOBIN/Net-Whois-Raw-2.99044/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e
- https://metacpan.org/release/PJCJ/Net-IDN-Encode-2.590-TRIAL/view/lib/Net/IDN/Punycode.pm#... 9b29abf9-4ab0-4765-b253-1875cd9b441e
- https://security.metacpan.org/patches/N/Net-Whois-Raw/2.99043/CVE-2026-19954-r1.patch 9b29abf9-4ab0-4765-b253-1875cd9b441e
- https://www.rfc-editor.org/rfc/rfc5891#section-5.2 9b29abf9-4ab0-4765-b253-1875cd9b441e
- http://www.openwall.com/lists/oss-security/2026/10/05/9 af854a3a-2127-422b-91ae-364da2661108