CVE-2026-19954 Affecting libnet-whois-raw-perl package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN13-LIBNETWHOISRAWPERL-20511670
- published5 Oct 2026
- disclosed5 Oct 2026
Introduced: 5 Oct 2026
NewCVE-2026-19954 (opens in a new tab)How to fix?
There is no fixed version for Debian:13 libnet-whois-raw-perl.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libnet-whois-raw-perl package and not the libnet-whois-raw-perl package as distributed by Debian.
See How to fix? for Debian:13 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-19954
- https://github.com/regru/Net-Whois-Raw/issues/34
- https://github.com/regru/Net-Whois-Raw/pull/35
- https://metacpan.org/release/NALOBIN/Net-Whois-Raw-2.99044/changes
- https://metacpan.org/release/PJCJ/Net-IDN-Encode-2.590-TRIAL/view/lib/Net/IDN/Punycode.pm#WARNING
- https://security.metacpan.org/patches/N/Net-Whois-Raw/2.99043/CVE-2026-19954-r1.patch
- https://www.rfc-editor.org/rfc/rfc5891#section-5.2
- http://www.openwall.com/lists/oss-security/2026/10/05/9