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OpenAdvisories
High RHSA-2026:51059 3 CVEs

Red Hat Security Advisory: libXfont2 security update

Published Aug 7, 2026 · Updated Oct 17, 2026

Ecosystem: Red Hat

Fixed packages 6

ReleasePackageFixed in
Red Hat · RHEL 9.6 EUS rhel_eus:9.6::appstream libXfont2 0:2.0.3-12.el9_6.1
Red Hat · RHEL 9.6 EUS rhel_eus:9.6::appstream libXfont2-debuginfo 0:2.0.3-12.el9_6.1
Red Hat · RHEL 9.6 EUS rhel_eus:9.6::appstream libXfont2-debugsource 0:2.0.3-12.el9_6.1
Red Hat · RHEL 9.6 EUS rhel_eus:9.6::crb libXfont2-debuginfo 0:2.0.3-12.el9_6.1
Red Hat · RHEL 9.6 EUS rhel_eus:9.6::crb libXfont2-debugsource 0:2.0.3-12.el9_6.1
Red Hat · RHEL 9.6 EUS rhel_eus:9.6::crb libXfont2-devel 0:2.0.3-12.el9_6.1

Vulnerabilities 3

  • High 8.5
    CVE-2026-56001

    libXfont2 BitmapScaleBitmaps Integer Overflow Heap Buffer Overflow

    A heap buffer overflow in BitmapScaleBitmaps in libXfont2 before 2.0.8 due to an overflowing 32bit size could be used by attackers able to access the X Server to execute code within the X server cont

    X.Org libXfont2 libxfont libxfont Debian Ubuntu Azure Linux Alpine
  • High 8.5
    CVE-2026-56002

    libXfont2 PCF Font Parsing Heap Buffer Overflow

    A heap bufferflow in pcfReadFont() due to missing glyph bounds checking in libXfont2 before 2.0.8  allows attackers authenticated as X client to execute code within the X server.

    X.Org libXfont2 libxfont libxfont Debian Ubuntu Azure Linux Alpine
  • High 8.5
    CVE-2026-56003

    libXfont2 computeProps Property Buffer Heap Buffer Overflow

    A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.

    X.Org libXfont2 libxfont libxfont Debian Ubuntu Azure Linux Alpine

References

  • article
    https://access.redhat.com/security/updates/classification/#important
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2496640
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2496641
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2496642
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_51059.json
  • report
    https://access.redhat.com/security/cve/CVE-2026-56001
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-56001
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-56001
  • report
    https://access.redhat.com/security/cve/CVE-2026-56002
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-56002
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-56002
  • report
    https://access.redhat.com/security/cve/CVE-2026-56003
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-56003
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-56003