Name: CVE-2026-56002: Heap-based Buffer Overflow
Creator: Rapid7
Published: 2026-07-08T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-56002, CWE-122, CVSS 8.8, EPSS 0.00428

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.

CVSS Details

CVSS 3.1 Base Score: 8.8
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alma_linux	—	Upgrade libXfont2Upgrade libXfont2-devel	Jul 30, 2026	Jul 28, 2026
Alpine Linux	—	Upgrade libxfont2	Jul 9, 2026	Jul 8, 2026
Amazon Linux Ami 2	—	Upgrade libXfont2Upgrade libXfont2-debuginfoUpgrade libXfont2-develUpgrade libXfontUpgrade libXfont-develUpgrade libXfont-debuginfo	Jul 22, 2026	Jul 22, 2026
Amazon_linux_2023	—	Upgrade libXfont2-debugsourceUpgrade libXfont2-develUpgrade libXfont2Upgrade libXfont2-debuginfo	Jul 21, 2026	Jul 8, 2026
Debian	—	Upgrade libxfont	Jul 13, 2026	Jul 13, 2026
Freebsd	—	Upgrade libXfont2	Jul 9, 2026	Jul 8, 2026
Redhat_linux	—	Upgrade libXfont2-debugsourceUpgrade libXfont2-debuginfoUpgrade libXfont2Upgrade libXfont2-devel	Jul 30, 2026	Jul 8, 2026
Rocky_linux	—	Upgrade libXfont2Upgrade libXfont2-develUpgrade libXfont2-debuginfoUpgrade libXfont2-debugsource	Jul 30, 2026	Jul 29, 2026
Ubuntu	—	Upgrade libxfont1 (Ubuntu Pro)Upgrade libxfont2 (Ubuntu Pro)Upgrade libxfont2	Jul 21, 2026	Jul 20, 2026

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CVSS Details

Covered by Rapid7

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