CVE-2026-59679

A flaw was found in the libXfont2 font-server client. A remote attacker, by operating a malicious font server, could exploit an out-of-bounds read/write vulnerability. This occurs because the client incorrectly handles font data, leading to an out-of-bounds memory access. This can lead to privilege escalation if the X server runs with root privileges, or a denial of service (crash) if it runs as an unprivileged user.

This flaw in libXfont2 could lead to privilege escalation or denial of service. A remote attacker operating a malicious font server could exploit an out-of-bounds memory access in the font-server client. This is rated Important because while privilege escalation requires the X server to run as root (not a default in modern Red Hat Enterprise Linux), denial of service remains a risk for users of graphical environments who connect to untrusted font servers.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.