CVE-2026-19954CWE-176

CVE-2026-19954

Medium · published October 5, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
11.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00216 · 11.5th percentile
Weakness
CWE-176 · Improper Handling of Unicode Encoding
Published
2026-10-05T11:16Z
References (7)
https://github.com/regru/Net-Whois-Raw/issues/34 · 9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://github.com/regru/Net-Whois-Raw/pull/35 · 9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/NALOBIN/Net-Whois-Raw-2.99044/changes · 9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://metacpan.org/release/PJCJ/Net-IDN-Encode-2.590-TRIAL/view/lib/Net/IDN/Punycode.pm#WARNING · 9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://security.metacpan.org/patches/N/Net-Whois-Raw/2.99043/CVE-2026-19954-r1.patch · 9b29abf9-4ab0-4765-b253-1875cd9b441ehttps://www.rfc-editor.org/rfc/rfc5891#section-5.2 · 9b29abf9-4ab0-4765-b253-1875cd9b441ehttp://www.openwall.com/lists/oss-security/2026/10/05/9 · af854a3a-2127-422b-91ae-364da2661108
EPSS history
Timeline
  • 07 OCT 03:40Z
    EPSS moved — → 0%
    epss
  • 05 OCT 06:54Z
    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
    cvelistv5