CVE-2026-56002 — HIGH (8.5)

Q: What is CVE-2026-56002?

CVE-2026-56002 is a vulnerability with a CVSS score of 8.5 (HIGH). 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.

Q: How severe is CVE-2026-56002?

CVE-2026-56002 has been rated HIGH with a CVSS base score of 8.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-56002?

Check the references section above for vendor advisories and patch information. Affected products include: X Libxfont.

Vulnerability Description

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 Score

8.5

HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
X	Libxfont	< 2.0.8

Related Weaknesses (CWE)

CWE-122

References

https://gitlab.freedesktop.org/xorg/lib/libxfont/-/commit/b4389e0b1d84a690b819bbPatch
https://www.openwall.com/lists/oss-security/2026/07/08/1Mailing ListPatchThird Party Advisory

FAQ

What is CVE-2026-56002?

CVE-2026-56002 is a vulnerability with a CVSS score of 8.5 (HIGH). 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.

How severe is CVE-2026-56002?

CVE-2026-56002 has been rated HIGH with a CVSS base score of 8.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-56002?

Check the references section above for vendor advisories and patch information. Affected products include: X Libxfont.