The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:20597 advisory.

    The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard     math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system.
    Without these libraries, the Linux system cannot function correctly.

    Security Fix(es):

    * glibc: glibc: Incorrect DNS response parsing via crafted DNS server response (CVE-2026-4437)

    * glibc: glibc: Invalid DNS hostname returned via gethostbyaddr functions (CVE-2026-4438)

    * glibc: glibc: Denial of Service via iconv() function with specific character sets (CVE-2026-4046)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Detections

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RHEL 9 : glibc (RHSA-2026:20597)

medium Nessus Plugin ID 316898

Version 1.2

Version 1.1

Version 1.2 Jul 18, 2026, 3:00 PM Plugin metadata (Add IAVM Info) Plugin Feed: 202607181500
Version 1.1 May 27, 2026, 1:37 PM New Plugin Feed: 202605271337