CVEvulnerability
CVE-2026-19954
5.4 MEDIUM
Official page ↗
- Status
- Deferred
- Published
- 2026-10-05
- Last modified
- 2026-10-06
- Assigner
- 9b29abf9-4ab0-4765-b253-1875cd9b441e
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 5.4 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- Weaknesses
- CWE-176
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.
Related
Weakness · CWE (1)
- CWE-176 Improper Handling of Unicode Encoding weakness
References
- https://github.com/regru/Net-Whois-Raw/issues/34 github.com
- https://github.com/regru/Net-Whois-Raw/pull/35 github.com
- https://metacpan.org/release/NALOBIN/Net-Whois-Raw-2.99044/changes metacpan.org
- https://metacpan.org/release/PJCJ/Net-IDN-Encode-2.590-TRIAL/view/lib/Net/IDN/Punycode.pm#WARNING metacpan.org
- https://security.metacpan.org/patches/N/Net-Whois-Raw/2.99043/CVE-2026-19954-r1.patch security.metacpan.org
- https://www.rfc-editor.org/rfc/rfc5891#section-5.2 www.rfc-editor.org
- http://www.openwall.com/lists/oss-security/2026/10/05/9 www.openwall.com