The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS     backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being     returned to the caller in violation of the DNS specification. (CVE-2026-4438)

Note that Nessus relies on the presence of the package as reported by the vendor.

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Linux Distros Unpatched Vulnerability : CVE-2026-4438

medium Nessus Plugin ID 303236

Version 1.3