# CVE-2026-19954: libnet-whois-raw-perl: Net::Whois::Raw versions before 2.99044 for Perl ship a pwhois command-line tool that queries WHOIS for the wrong dom...

CVE-2026-19954 is fixed in 3 products on 1 platform, first by DEBIAN-CVE-2026-19954, released October 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-19954
- Priority: Routine
- CVSS: 5.4 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 5, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libnet-whois-raw-perl Debian 14 | 2.99043-2 | [DEBIAN-CVE-2026-19954](https://patchblox.com/security/data/fix/linux/debian-cve-2026-19954.md) | Oct 10, 2026 |
| Linux | perl-Net-Whois-Raw Fedora 43 | 2.99.044-1.fc43 | [FEDORA-2026-C330A15C68](https://patchblox.com/security/data/fix/linux/fedora-2026-c330a15c68.md) | Nov 7, 2026 |
| Linux | pwhois Fedora 43 | 2.99.044-1.fc43 | [FEDORA-2026-C330A15C68](https://patchblox.com/security/data/fix/linux/fedora-2026-c330a15c68.md) | Nov 7, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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