UnratedFix available
libx11 vulnerabilities
Type: advisorySources: OSV
Adam Bedard discovered that libx11 incorrectly handled certain XKB keyboard map replies. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-88806) It was discovered that libx11 incorrectly handled certain X Input Method (XIM) messages. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use these issues to cause libx11 to crash, resulting in a denial of service. (CVE-2026-94283, CVE-2026-94284) It was discovered that libx11 incorrectly handled converting certain multibyte text. An attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service. (CVE-2026-94285)
- Products
- libx11
- Affected versions
- 2:1.6.1-1ubuntu1, 2:1.6.1-1ubuntu2, 2:1.6.2-1ubuntu1, 2:1.6.2-1ubuntu2, 2:1.6.2-1ubuntu2.1, 2:1.6.2-1ubuntu2.1+esm1, 2:1.6.2-1ubuntu2.1+esm2, 2:1.6.2-1ubuntu2.1+esm3, 2:1.6.2-1ubuntu2.1+esm4, 2:1.6.2-1ubuntu2.1+esm5, 2:1.6.3-1ubuntu2, 2:1.6.3-1ubuntu2.1, 2:1.6.3-1ubuntu2.2, 2:1.6.3-1ubuntu2.2+esm1, 2:1.6.3-1ubuntu2.2+esm2, 2:1.6.3-1ubuntu2.2+esm3, 2:1.6.3-1ubuntu2.2+esm4, 2:1.6.4-3, 2:1.6.4-3ubuntu0.1, 2:1.6.4-3ubuntu0.2, 2:1.6.4-3ubuntu0.3, 2:1.6.4-3ubuntu0.4, 2:1.6.4-3ubuntu0.4+esm1, 2:1.6.4-3ubuntu0.4+esm2, 2:1.6.8-1, 2:1.6.9-2, 2:1.6.9-2ubuntu1, 2:1.6.9-2ubuntu1.1, 2:1.6.9-2ubuntu1.2, 2:1.6.9-2ubuntu1.5, 2:1.6.9-2ubuntu1.6, 2:1.7.2-1, 2:1.7.2-2, 2:1.7.2-2build1, 2:1.7.5-1, 2:1.7.5-1ubuntu0.2, 2:1.7.5-1ubuntu0.3, 2:1.8.12-1build1, 2:1.8.12-1build2, 2:1.8.13-1, 2:1.8.6-1ubuntu1, 2:1.8.7-1, 2:1.8.7-1build1
- Fixed versions
- 2:1.6.2-1ubuntu2.1+esm6, 2:1.6.3-1ubuntu2.2+esm5, 2:1.6.4-3ubuntu0.4+esm3, 2:1.6.9-2ubuntu1.6+esm1, 2:1.7.5-1ubuntu0.4, 2:1.8.13-1ubuntu0.1, 2:1.8.7-1ubuntu0.1
- CVEs
- CVE-2026-88806, CVE-2026-94283, CVE-2026-94284, CVE-2026-94285
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 08:49 UTC · Revision 1
Source evidence
Adam Bedard discovered that libx11 incorrectly handled certain XKB keyboard map replies. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-88806) It was discovered that libx11 incorrectly handled certain X Input Method (XIM) messages. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use these issues to cause libx11 to crash, resulting in a denial of service. (CVE-2026-94283, CVE-2026-94284) It was discovered that libx11 incorrectly handled converting certain multibyte text. An attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service. (CVE-2026-94285)
osv:USN-8913-1
libx11
Fixed versions: 2:1.6.2-1ubuntu2.1+esm6
libx11
Fixed versions: 2:1.6.3-1ubuntu2.2+esm5
libx11
Fixed versions: 2:1.6.4-3ubuntu0.4+esm3
libx11
Fixed versions: 2:1.6.9-2ubuntu1.6+esm1
libx11
Fixed versions: 2:1.7.5-1ubuntu0.4
libx11
Fixed versions: 2:1.8.7-1ubuntu0.1
libx11
Fixed versions: 2:1.8.13-1ubuntu0.1
Complete source record
{
"id": "7c3ed1b7c2ab68335acee1126988661c319e59f3ff4ce1601ccc4a4df4ef58c3",
"url": "https://osv.dev/vulnerability/USN-8913-1",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "libx11 vulnerabilities",
"summary": "Adam Bedard discovered that libx11 incorrectly handled certain XKB keyboard map replies. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-88806) It was discovered that libx11 incorrectly handled certain X Input Method (XIM) messages. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use these issues to cause libx11 to crash, resulting in a denial of service. (CVE-2026-94283, CVE-2026-94284) It was discovered that libx11 incorrectly handled converting certain multibyte text. An attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service. (CVE-2026-94285)",
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{
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{
"value": "2:1.6.4-3ubuntu0.4",
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{
"value": "2:1.6.4-3ubuntu0.4+esm1",
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{
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"value": "2:1.7.5-1ubuntu0.4",
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{
"value": "2:1.7.2-1",
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"value": "2:1.7.2-2",
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{
"value": "2:1.7.2-2build1",
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{
"value": "2:1.7.5-1",
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{
"value": "2:1.7.5-1ubuntu0.2",
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{
"value": "2:1.7.5-1ubuntu0.3",
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{
"value": "2:1.8.12-1build2",
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{
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"id": "CVE-2026-94283",
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},
{
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]
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{
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},
{
"type": "Ubuntu",
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{
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{
"type": "Ubuntu",
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]
}
],
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},
"ecosystem_specific": {
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{
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"binary_version": "2:1.6.2-1ubuntu2.1+esm6"
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{
"binary_name": "libx11-xcb1",
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],
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}
},
{
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"package": {
"name": "libx11",
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"ecosystem": "Ubuntu:Pro:16.04:LTS"
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{
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},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94283",
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{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
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}
]
},
{
"id": "CVE-2026-94284",
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{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94285",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:Pro:16.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libx11-6",
"binary_version": "2:1.6.3-1ubuntu2.2+esm5"
},
{
"binary_name": "libx11-data",
"binary_version": "2:1.6.3-1ubuntu2.2+esm5"
},
{
"binary_name": "libx11-xcb1",
"binary_version": "2:1.6.3-1ubuntu2.2+esm5"
}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
}
},
{
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{
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{
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},
{
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}
]
}
],
"package": {
"name": "libx11",
"purl": "pkg:deb/ubuntu/libx11?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"2:1.6.4-3",
"2:1.6.4-3ubuntu0.1",
"2:1.6.4-3ubuntu0.2",
"2:1.6.4-3ubuntu0.3",
"2:1.6.4-3ubuntu0.4",
"2:1.6.4-3ubuntu0.4+esm1",
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],
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"cves_map": {
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{
"id": "CVE-2026-88806",
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{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94283",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94284",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94285",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
}
],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libx11-6",
"binary_version": "2:1.6.4-3ubuntu0.4+esm3"
},
{
"binary_name": "libx11-data",
"binary_version": "2:1.6.4-3ubuntu0.4+esm3"
},
{
"binary_name": "libx11-xcb1",
"binary_version": "2:1.6.4-3ubuntu0.4+esm3"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.6.9-2ubuntu1.6+esm1"
}
]
}
],
"package": {
"name": "libx11",
"purl": "pkg:deb/ubuntu/libx11?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"2:1.6.8-1",
"2:1.6.9-2",
"2:1.6.9-2ubuntu1",
"2:1.6.9-2ubuntu1.1",
"2:1.6.9-2ubuntu1.2",
"2:1.6.9-2ubuntu1.5",
"2:1.6.9-2ubuntu1.6"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8913-1.json",
"cves_map": {
"cves": [
{
"id": "CVE-2026-88806",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94283",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94284",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
]
},
{
"id": "CVE-2026-94285",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"
},
{
"type": "Ubuntu",
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}
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},
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],
"modified": "2026-10-12T20:28:09.464073800Z",
"provider": "osv",
"upstream": [
"CVE-2026-88806",
"CVE-2026-94283",
"CVE-2026-94284",
"CVE-2026-94285",
"UBUNTU-CVE-2026-88806",
"UBUNTU-CVE-2026-94283",
"UBUNTU-CVE-2026-94284",
"UBUNTU-CVE-2026-94285"
],
"references": [
"https://ubuntu.com/security/notices/USN-8913-1",
"https://ubuntu.com/security/CVE-2026-88806",
"https://ubuntu.com/security/CVE-2026-94283",
"https://ubuntu.com/security/CVE-2026-94284",
"https://ubuntu.com/security/CVE-2026-94285"
]
},
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{
"value": "CVE-2026-88806",
"evidence": "/upstream"
},
{
"value": "CVE-2026-94283",
"evidence": "/upstream"
},
{
"value": "CVE-2026-94284",
"evidence": "/upstream"
},
{
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"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 306756,
"published_at": "2026-10-12T12:53:41+00:00"
}