CVE-2026-55999

Name
CVE-2026-55999
Description
Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
meissner@suse.de https://gitlab.freedesktop.org/xorg/xserver/-/commit/fbf7bac22e2c6bd627fb042742a23318263edae1
meissner@suse.de https://www.openwall.com/lists/oss-security/2026/07/08/2

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* x_server >= None < 21.2.24
cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:* xwayland >= None < 24.1.13

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
xwayland edge-community 24.1.13-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 24.1.12-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 24.1.11-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 24.1.10-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 24.1.9-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 24.1.8-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 24.1.7-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 24.1.6-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 24.1.5-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 24.1.4-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 23.2.5-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 23.2.4-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 23.2.2-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland edge-community 22.1.8-r0 psykose <alice@ayaya.dev> fixed
xwayland edge-community 22.1.6-r0 psykose <alice@ayaya.dev> fixed
xwayland edge-community 21.1.4-r0 None possibly vulnerable
xwayland edge-community 21.1.0-r4 None possibly vulnerable
xwayland 3.24-community 24.1.13-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xwayland 3.24-community 24.1.12-r0 Simon Zeni <simon@bl4ckb0ne.ca> fixed
xorg-server edge-community 21.1.24-r0 Natanael Copa <ncopa@alpinelinux.org> fixed
xorg-server 3.24-community 21.1.24-r0 Natanael Copa <ncopa@alpinelinux.org> fixed