CriticalFix available
xorg-server, xwayland — security advisory
A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.
- Products
- xorg-server, xwayland
- Affected versions
- 2:21.1.16-1.3, 2:21.1.16-1.3+deb13u1, 2:21.1.18-1, 2:21.1.18-2, 2:21.1.20-1, 2:21.1.21-1, 2:21.1.7-3, 2:21.1.7-3+deb12u1, 2:21.1.7-3+deb12u10, 2:21.1.7-3+deb12u11, 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, 2:22.1.9-1, 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, 2:24.0.99.901-1, 2:24.1.0-1, 2:24.1.10-1, 2:24.1.11-1, 2:24.1.12-1, 2:24.1.13-1, 2:24.1.14-1, 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
- Fixed versions
- 2:21.1.16-1.3+deb13u2, 2:21.1.22-1, 2:21.1.7-3+deb12u12, 2:24.1.10-1
- CVEs
- CVE-2026-34000
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:52 UTC · Revision 2
Source evidence
A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.
osv:DEBIAN-CVE-2026-34000
xorg-server
Fixed versions: 2:21.1.7-3+deb12u12
xorg-server
Fixed versions: 2:21.1.16-1.3+deb13u2
xorg-server
Fixed versions: 2:21.1.22-1
xwayland
Fixed versions: Not specified
xwayland
Fixed versions: Not specified
xwayland
Fixed versions: 2:24.1.10-1
Complete source record
{
"id": "f5df10b2371ab561946818d27a6f853f62bf61680fa870db4c65c35a501d5519",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-34000",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-34000",
"summary": "A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.",
"evidence": "osv:DEBIAN-CVE-2026-34000",
"products": [
{
"name": {
"value": "xorg-server",
"evidence": "/affected/0/package/name"
},
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"fixed_versions": [
{
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"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
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"evidence": "/affected/0/versions"
},
{
"value": "2:21.1.7-3+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2:21.1.7-3+deb12u10",
"evidence": "/affected/0/versions"
},
{
"value": "2:21.1.7-3+deb12u11",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
"value": "2:21.1.7-3+deb12u3",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
},
{
"value": "2:21.1.7-3+deb12u7",
"evidence": "/affected/0/versions"
},
{
"value": "2:21.1.7-3+deb12u8",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/1/versions"
},
{
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]
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{
"name": {
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{
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{
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{
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{
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]
},
{
"name": {
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"evidence": "/affected/3/package/name"
},
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"affected_versions": [
{
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{
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"evidence": "/affected/3/versions"
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{
"value": "2:23.1.1-1",
"evidence": "/affected/3/versions"
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{
"value": "2:23.2.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:23.2.1-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:23.2.2-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:23.2.3-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:23.2.4-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:23.2.6-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.0.99.901-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.10-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.11-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.12-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.13-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.14-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.2-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.3-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.4-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.4-2",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.4-3",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.5-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.6-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.8-1",
"evidence": "/affected/3/versions"
},
{
"value": "2:24.1.9-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "xwayland",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "2:24.1.10-1",
"evidence": "/affected/4/versions"
},
{
"value": "2:24.1.11-1",
"evidence": "/affected/4/versions"
},
{
"value": "2:24.1.12-1",
"evidence": "/affected/4/versions"
},
{
"value": "2:24.1.13-1",
"evidence": "/affected/4/versions"
},
{
"value": "2:24.1.14-1",
"evidence": "/affected/4/versions"
},
{
"value": "2:24.1.6-1",
"evidence": "/affected/4/versions"
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{
"value": "2:24.1.8-1",
"evidence": "/affected/4/versions"
},
{
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]
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
"prerequisites": [],
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{
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"evidence": "/affected/5/ranges"
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],
"affected_versions": [
{
"value": "2:24.1.6-1",
"evidence": "/affected/5/versions"
},
{
"value": "2:24.1.8-1",
"evidence": "/affected/5/versions"
},
{
"value": "2:24.1.9-1",
"evidence": "/affected/5/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-34000",
"aliases": [
"DEBIAN-CVE-2026-34000"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
}
],
"affected": [
{
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{
"type": "ECOSYSTEM",
"events": [
{
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},
{
"fixed": "2:21.1.7-3+deb12u12"
}
]
}
],
"package": {
"name": "xorg-server",
"purl": "pkg:deb/debian/xorg-server?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"2:21.1.7-3+deb12u1",
"2:21.1.7-3+deb12u10",
"2:21.1.7-3+deb12u11",
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34000.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
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{
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},
{
"fixed": "2:21.1.16-1.3+deb13u2"
}
]
}
],
"package": {
"name": "xorg-server",
"purl": "pkg:deb/debian/xorg-server?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2:21.1.16-1.3",
"2:21.1.16-1.3+deb13u1"
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],
"package": {
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"purl": "pkg:deb/debian/xorg-server?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
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],
"database_specific": {
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},
"ecosystem_specific": {
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}
},
{
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}
],
"package": {
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"purl": "pkg:deb/debian/xwayland?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"2:24.1.14-1",
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"2:24.1.3-1",
"2:24.1.4-1",
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"2:24.1.5-1",
"2:24.1.6-1",
"2:24.1.8-1",
"2:24.1.9-1"
],
"database_specific": {
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},
"ecosystem_specific": {
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}
},
{
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}
],
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"purl": "pkg:deb/debian/xwayland?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
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"2:24.1.12-1",
"2:24.1.13-1",
"2:24.1.14-1",
"2:24.1.6-1",
"2:24.1.8-1",
"2:24.1.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34000.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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{
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},
{
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]
}
],
"package": {
"name": "xwayland",
"purl": "pkg:deb/debian/xwayland?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2:24.1.6-1",
"2:24.1.8-1",
"2:24.1.9-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34000.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T10:00:12.785000115Z",
"provider": "osv",
"upstream": [
"CVE-2026-34000"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-34000"
]
},
"related_cves": [
{
"value": "CVE-2026-34000",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 461405,
"published_at": "2026-05-05T16:16:11.647+00:00"
}