The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an application. This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from systems that do not need them.

The remote RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:20597 advisory.

    * 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)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

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

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-50291 advisory.

    - Add tests for CVE-2026-4437 and CVE-2026-4438 (RHEL-173358)
    - CVE-2026-4046: Fix assertion failure in IBM1390 and IBM1399 iconv modules       (RHEL-162891)
    - CVE-2025-15281: wordexp WRDE_REUSE uninitialized memory read (RHEL-142787)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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

The remote RockyLinux 8 host has packages installed that are affected by a vulnerability as referenced in the RLSA-2026:20587 advisory.

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

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

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

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-726:04 advisory.

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

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

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

The remote AlmaLinux 8 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2026:20587 advisory.

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

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

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

The remote AlmaLinux 10 host has packages installed that are affected by a vulnerability as referenced in the ALSA-2026:20594 advisory.

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

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

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

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-20587 advisory.

    - Add tests for CVE-2026-4437 and CVE-2026-4438 (RHEL-173358)
    - CVE-2026-4046: Fix assertion failure in IBM1390 and IBM1399 iconv modules       (RHEL-162891)
    - CVE-2025-15281: wordexp WRDE_REUSE uninitialized memory read (RHEL-142787)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

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

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.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:20587 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: 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 this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:20594 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: 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 this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-4b7780802c advisory.

    This update provides various security fixes.

    * Buffer overflow in `scanf` `%mc` (CVE-2026-5450)
    * `ns_sprintrrf` buffer overreads (CVE-2026-6238)
    * `ns_sprintrrf` buffer overflow in TSIG record processing (CVE-2026-5435)
    * Memory corruption in `ungetwc` (CVE-2026-5928)
    * Assertion failure in `iconv` with IBM1390, IBM1399 charsets (CVE-2026-4046)


Tenable has extracted the preceding description block directly from the Fedora security advisory.

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

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-ced72ab158 advisory.

    This update provides various security fixes.

    * Buffer overflow in `scanf` `%mc` (CVE-2026-5450)
    * `ns_sprintrrf` buffer overreads (CVE-2026-6238)
    * `ns_sprintrrf` buffer overflow in TSIG record processing (CVE-2026-5435)
    * Memory corruption in `ungetwc` (CVE-2026-5928)
    * Assertion failure in `iconv` with IBM1390, IBM1399 charsets (CVE-2026-4046)


Tenable has extracted the preceding description block directly from the Fedora security advisory.

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

The remote SUSE Linux SLES15 host has a package installed that is affected by a vulnerability as referenced in the SUSE- SU-2026:1662-1 advisory.

    This update for glibc-livepatches fixes the following issue:

    Security fixes:

    - CVE-2026-4046: assertion failure when converting inputs may be used to remotely crash an application     (bsc#1261209).

    Other fixes:

    - Fix problems with livepatches targeting libc-2.31.so instead of      libc.so.6 in 15.4 (bsc#1263035).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1622 advisory.

    The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure     when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an     application.



    This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from     systems that do not need them. (CVE-2026-4046)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

The version of glibc installed on the remote host is prior to 2.26-64. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3272 advisory.

    The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure     when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an     application.



    This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from     systems that do not need them. (CVE-2026-4046)

Tenable has extracted the preceding description block directly from the tested product security advisory.

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-014283 advisory.

    The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure     when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an     application.



    This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character sets from     systems that do not need them.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

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

The remote SUSE Linux SLES15 host has a package installed that is affected by a vulnerability as referenced in the SUSE- SU-2026:1498-1 advisory.

    This update for glibc-livepatches fixes the following issue:

    - CVE-2026-4046: assertion failure when converting inputs may be used to remotely crash an application     (bsc#1261209).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

The remote SUSE Linux SLES15 host has a package installed that is affected by a vulnerability as referenced in the SUSE- SU-2026:1501-1 advisory.

    This update for glibc-livepatches fixes the following issue:

    - CVE-2026-4046: assertion failure when converting inputs may be used to remotely crash an application     (bsc#1261209).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

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

An update of the glibc package has been released.

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

  - The iconv() function in the GNU C Library versions 2.43 and earlier may crash due to an assertion failure     when converting inputs from the IBM1390 or IBM1399 character sets, which may be used to remotely crash an     application. This vulnerability can be trivially mitigated by removing the IBM1390 and IBM1399 character     sets from systems that do not need them. (CVE-2026-4046)

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

ID	Name	Product	Family	Severity
318034	RockyLinux 9 : glibc (RLSA-2026:20597)	Nessus	Rocky Linux Local Security Checks	medium
317882	Oracle Linux 8 : glibc (ELSA-2026-50291)	Nessus	Oracle Linux Local Security Checks	high
317488	RockyLinux 8 : glibc (RLSA-2026:20587)	Nessus	Rocky Linux Local Security Checks	high
317384	MiracleLinux 8 : glibc-2.28-251.el8_10.37 (AXSA:2026-726:04)	Nessus	Miracle Linux Local Security Checks	medium
317112	AlmaLinux 8 : glibc (ALSA-2026:20587)	Nessus	Alma Linux Local Security Checks	high
317111	AlmaLinux 10 : glibc (ALSA-2026:20594)	Nessus	Alma Linux Local Security Checks	high
317084	Oracle Linux 8 : glibc (ELSA-2026-20587)	Nessus	Oracle Linux Local Security Checks	high
316898	RHEL 9 : glibc (RHSA-2026:20597)	Nessus	Red Hat Local Security Checks	medium
316822	RHEL 8 : glibc (RHSA-2026:20587)	Nessus	Red Hat Local Security Checks	high
316774	RHEL 10 : glibc (RHSA-2026:20594)	Nessus	Red Hat Local Security Checks	high
312242	Fedora 43 : glibc (2026-4b7780802c)	Nessus	Fedora Local Security Checks	critical
311773	Fedora 44 : glibc (2026-ced72ab158)	Nessus	Fedora Local Security Checks	critical
311750	SUSE SLES15 Security Update : glibc-livepatches (SUSE-SU-2026:1662-1)	Nessus	SuSE Local Security Checks	high
311343	Amazon Linux 2023 : compat-libpthread-nonshared, glibc, glibc-all-langpacks (ALAS2023-2026-1622)	Nessus	Amazon Linux Local Security Checks	high
311224	Amazon Linux 2 : glibc, --advisory ALAS2-2026-3272 (ALAS-2026-3272)	Nessus	Amazon Linux Local Security Checks	high
309987	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: glibc (UTSA-2026-014283)	Nessus	Unity Linux Local Security Checks	high
309165	SUSE SLES15 Security Update : glibc-livepatches (SUSE-SU-2026:1498-1)	Nessus	SuSE Local Security Checks	high
309119	SUSE SLES15 Security Update : glibc-livepatches (SUSE-SU-2026:1501-1)	Nessus	SuSE Local Security Checks	high
306996	Photon OS 5.0: Glibc PHSA-2026-5.0-0824	Nessus	PhotonOS Local Security Checks	high
304363	Linux Distros Unpatched Vulnerability : CVE-2026-4046	Nessus	Misc.	high

Detections

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CVE-2026-4046

high

Tenable Plugins

medium

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critical

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