libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:59312 advisory.

    X.Org X11 libXfont2 runtime library

    Security Fix(es):

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)

    * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

    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 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:59311 advisory.

    X.Org X11 libXfont2 runtime library

    Security Fix(es):

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)

    * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

    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 MiracleLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1637:04 advisory.

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)
      * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

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 Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-55446 advisory.

    - CVE fix for: CVE-2026-59679       Resolves: https://redhat.atlassian.net/browse/RHEL-221956

Tenable has extracted the preceding description block directly from the Oracle 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 AlmaLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:55447 advisory.

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)
      * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:55448 advisory.

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)
      * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 multiple vulnerabilities as referenced in the ALSA-2026:55446 advisory.

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)
      * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

Tenable has extracted the preceding description block directly from the AlmaLinux 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 MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-1563:03 advisory.

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)
      * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

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 Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-55448 advisory.

    - CVE fix for: CVE-2026-59679       Resolves: https://redhat.atlassian.net/browse/RHEL-221949

Tenable has extracted the preceding description block directly from the Oracle 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 Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-55447 advisory.

    - CVE fix for: CVE-2026-59679       Resolves: https://redhat.atlassian.net/browse/RHEL-221957

Tenable has extracted the preceding description block directly from the Oracle 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 RockyLinux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:55447 advisory.

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)

    * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

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 RockyLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:55446 advisory.

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)

    * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

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 RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:55448 advisory.

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)

    * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

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 Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:55447 advisory.

    X.Org X11 libXfont2 runtime library

    Security Fix(es):

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)

    * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

    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 multiple vulnerabilities as referenced in the RHSA-2026:55446 advisory.

    X.Org X11 libXfont2 runtime library

    Security Fix(es):

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)

    * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

    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 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:55448 advisory.

    X.Org X11 libXfont2 runtime library

    Security Fix(es):

    * libxfont2: Font Server Client encoding[] Out-Of-Bounds Read/Write (CVE-2026-59679)

    * libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

    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 openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21539-1 advisory.

    - CVE-2026-44950: fs_read_glyphs() heap buffer overflow via cumulative glyph data overflow (bsc#1272661).
    - CVE-2026-59679: fs_read_glyphs() heap OOB read/write via encoding array index mismatch (bsc#1272660).

Tenable has extracted the preceding description block directly from the SUSE 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 version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 1fae5869-9275-11f1-83e9-901b0e13f1a0 advisory.

    Zhixi Jace Sun, independent security researcher reports:

Tenable has extracted the preceding description block directly from the FreeBSD 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 version of libXfont2 installed on the remote host is prior to 2.0.9. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-218-01 advisory.

    New libXfont2 packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the libXfont2 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 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-4f471dd34a advisory.

    libXfont2 2.0.9 (CVE-2026-59679, CVE-2026-44950)

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-c864897d56 advisory.

    libXfont2 2.0.9 (CVE-2026-59679, CVE-2026-44950)

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 SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3500-1 advisory.

    - CVE-2026-44950: fs_read_glyphs() heap buffer overflow via cumulative glyph data overflow (bsc#1272661).
    - CVE-2026-59679: fs_read_glyphs() heap OOB read/write via encoding array index mismatch (bsc#1272660).

Tenable has extracted the preceding description block directly from the SUSE 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 SLES12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3499-1 advisory.

    - CVE-2026-44950: fs_read_glyphs() heap buffer overflow via cumulative glyph data overflow (bsc#1272661).
    - CVE-2026-59679: fs_read_glyphs() heap OOB read/write via encoding array index mismatch (bsc#1272660).

Tenable has extracted the preceding description block directly from the SUSE 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - libxfonts2: libXfont2: Privilege Escalation via Heap Buffer Overflow in Font Server Client     (CVE-2026-44950)

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

ID	Name	Product	Family	Type	Severity
339454	RHEL 9 : libXfont2 (RHSA-2026:59312)	Nessus	Red Hat Local Security Checks	Local	high
339453	RHEL 9 : libXfont2 (RHSA-2026:59311)	Nessus	Red Hat Local Security Checks	Local	high
339110	MiracleLinux 9 : libXfont2-2.0.3-12.el9_8.3 (AXSA:2026-1637:04)	Nessus	Miracle Linux Local Security Checks	Local	high
338018	Oracle Linux 8 : libXfont2 (ELSA-2026-55446)	Nessus	Oracle Linux Local Security Checks	Local	high
337661	AlmaLinux 9 : libXfont2 (ALSA-2026:55447)	Nessus	Alma Linux Local Security Checks	Local	high
337648	AlmaLinux 10 : libXfont2 (ALSA-2026:55448)	Nessus	Alma Linux Local Security Checks	Local	high
337143	AlmaLinux 8 : libXfont2 (ALSA-2026:55446)	Nessus	Alma Linux Local Security Checks	Local	high
337127	MiracleLinux 8 : libXfont2-2.0.3-2.el8_10.3 (AXSA:2026-1563:03)	Nessus	Miracle Linux Local Security Checks	Local	high
336006	Oracle Linux 10 : libXfont2 (ELSA-2026-55448)	Nessus	Oracle Linux Local Security Checks	Local	high
336004	Oracle Linux 9 : libXfont2 (ELSA-2026-55447)	Nessus	Oracle Linux Local Security Checks	Local	high
335982	RockyLinux 9 : libXfont2 (RLSA-2026:55447)	Nessus	Rocky Linux Local Security Checks	Local	high
335978	RockyLinux 8 : libXfont2 (RLSA-2026:55446)	Nessus	Rocky Linux Local Security Checks	Local	high
335972	RockyLinux 10 : libXfont2 (RLSA-2026:55448)	Nessus	Rocky Linux Local Security Checks	Local	high
335961	RHEL 9 : libXfont2 (RHSA-2026:55447)	Nessus	Red Hat Local Security Checks	Local	high
335960	RHEL 8 : libXfont2 (RHSA-2026:55446)	Nessus	Red Hat Local Security Checks	Local	high
335922	RHEL 10 : libXfont2 (RHSA-2026:55448)	Nessus	Red Hat Local Security Checks	Local	high
333509	openSUSE 16 Security Update : libXfont2 (openSUSE-SU-2026:21539-1)	Nessus	SuSE Local Security Checks	Local	critical
333497	FreeBSD : libXfont2 -- multiple vulnerabilities (1fae5869-9275-11f1-83e9-901b0e13f1a0)	Nessus	FreeBSD Local Security Checks	Local	critical
333266	Slackware Linux 15.0 / current libXfont2 Multiple Vulnerabilities (SSA:2026-218-01)	Nessus	Slackware Local Security Checks	Local	critical
333259	Fedora 43 : libXfont2 (2026-4f471dd34a)	Nessus	Fedora Local Security Checks	Local	critical
333157	Fedora 44 : libXfont2 (2026-c864897d56)	Nessus	Fedora Local Security Checks	Local	critical
333041	SUSE SLED15 / SLES15 Security Update : libXfont2 (SUSE-SU-2026:3500-1)	Nessus	SuSE Local Security Checks	Local	critical
333023	SUSE SLES12 Security Update : libXfont2 (SUSE-SU-2026:3499-1)	Nessus	SuSE Local Security Checks	Local	critical
332114	Linux Distros Unpatched Vulnerability : CVE-2026-44950	Nessus	Misc.	Local	high

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