DEBIAN-CVE-2026-55999

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Source
https://security-tracker.debian.org/tracker/CVE-2026-55999
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55999.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-55999
Upstream
Published
2026-07-08T09:16:29Z
Modified
2026-09-12T13:00:08Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12
xorg-server

Package

Name
xorg-server
Purl
pkg:deb/debian/xorg-server?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:21.*
2:21.1.7-3
2:21.1.7-3+deb12u1
2:21.1.7-3+deb12u2
2:21.1.7-3+deb12u3
2:21.1.7-3+deb12u4
2:21.1.7-3+deb12u5
2:21.1.7-3+deb12u6
2:21.1.7-3+deb12u7
2:21.1.7-3+deb12u8
2:21.1.7-3+deb12u9
2:21.1.7-3+deb12u10
2:21.1.7-3+deb12u11
2:21.1.7-3+deb12u12
2:21.1.7-3+deb12u13
2:21.1.8-1
2:21.1.9-1
2:21.1.9-1+hurd.1
2:21.1.10-1
2:21.1.11-1
2:21.1.11-2
2:21.1.11-3
2:21.1.12-1
2:21.1.13-1
2:21.1.13-2
2:21.1.13-3
2:21.1.13-3.1
2:21.1.14-1
2:21.1.14-2
2:21.1.15-1
2:21.1.15-2
2:21.1.15-3
2:21.1.16-1
2:21.1.16-1.1
2:21.1.16-1.2
2:21.1.16-1.3
2:21.1.18-1
2:21.1.18-2
2:21.1.20-1
2:21.1.21-1
2:21.1.22-1
2:21.1.23-1
2:21.1.24-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55999.json"
xwayland

Package

Name
xwayland
Purl
pkg:deb/debian/xwayland?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:22.*
2:22.1.9-1
2:23.*
2:23.1.0-1
2:23.1.1-1
2:23.2.0-1
2:23.2.1-1
2:23.2.2-1
2:23.2.3-1
2:23.2.4-1
2:23.2.6-1
2:24.*
2:24.0.99.901-1
2:24.1.0-1
2:24.1.2-1
2:24.1.3-1
2:24.1.4-1
2:24.1.4-2
2:24.1.4-3
2:24.1.5-1
2:24.1.6-1
2:24.1.8-1
2:24.1.9-1
2:24.1.10-1
2:24.1.11-1
2:24.1.12-1
2:24.1.13-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55999.json"
Debian:13
xorg-server

Package

Name
xorg-server
Purl
pkg:deb/debian/xorg-server?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:21.1.16-1.3+deb13u4

Affected versions

2:21.*
2:21.1.16-1.3
2:21.1.16-1.3+deb13u1
2:21.1.16-1.3+deb13u2
2:21.1.16-1.3+deb13u3

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55999.json"
xwayland

Package

Name
xwayland
Purl
pkg:deb/debian/xwayland?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2:24.*
2:24.1.6-1
2:24.1.8-1
2:24.1.9-1
2:24.1.10-1
2:24.1.11-1
2:24.1.12-1
2:24.1.13-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55999.json"
Debian:14
xorg-server

Package

Name
xorg-server
Purl
pkg:deb/debian/xorg-server?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:21.1.24-1

Affected versions

2:21.*
2:21.1.16-1.3
2:21.1.18-1
2:21.1.18-2
2:21.1.20-1
2:21.1.21-1
2:21.1.22-1
2:21.1.23-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55999.json"
xwayland

Package

Name
xwayland
Purl
pkg:deb/debian/xwayland?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2:24.1.13-1

Affected versions

2:24.*
2:24.1.6-1
2:24.1.8-1
2:24.1.9-1
2:24.1.10-1
2:24.1.11-1
2:24.1.12-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55999.json"