HighFix available
libxml2 — security advisory
In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.
- Products
- libxml2
- Affected versions
- 2.14.5+dfsg-0.2, 2.14.5+dfsg-0.2build1, 2.15.1+dfsg-0.3, 2.15.1+dfsg-0.4, 2.15.1+dfsg-1, 2.15.1+dfsg-2, 2.15.1+dfsg-2ubuntu1, 2.15.1+dfsg-2ubuntu2, 2.15.2+dfsg-0.1, 2.15.2+dfsg-0.1ubuntu0.1, 2.15.2+dfsg-0.1ubuntu0.2, 2.9.1+dfsg1-3ubuntu2, 2.9.1+dfsg1-3ubuntu3, 2.9.1+dfsg1-3ubuntu4, 2.9.1+dfsg1-3ubuntu4.1, 2.9.1+dfsg1-3ubuntu4.10, 2.9.1+dfsg1-3ubuntu4.11, 2.9.1+dfsg1-3ubuntu4.12, 2.9.1+dfsg1-3ubuntu4.13, 2.9.1+dfsg1-3ubuntu4.13+esm1, 2.9.1+dfsg1-3ubuntu4.13+esm10, 2.9.1+dfsg1-3ubuntu4.13+esm11, 2.9.1+dfsg1-3ubuntu4.13+esm12, 2.9.1+dfsg1-3ubuntu4.13+esm2, 2.9.1+dfsg1-3ubuntu4.13+esm3, 2.9.1+dfsg1-3ubuntu4.13+esm4, 2.9.1+dfsg1-3ubuntu4.13+esm5, 2.9.1+dfsg1-3ubuntu4.13+esm6, 2.9.1+dfsg1-3ubuntu4.13+esm7, 2.9.1+dfsg1-3ubuntu4.13+esm8, 2.9.1+dfsg1-3ubuntu4.13+esm9, 2.9.1+dfsg1-3ubuntu4.2, 2.9.1+dfsg1-3ubuntu4.3, 2.9.1+dfsg1-3ubuntu4.4, 2.9.1+dfsg1-3ubuntu4.5, 2.9.1+dfsg1-3ubuntu4.6, 2.9.1+dfsg1-3ubuntu4.7, 2.9.1+dfsg1-3ubuntu4.8, 2.9.1+dfsg1-3ubuntu4.9, 2.9.10+dfsg-1ubuntu3, 2.9.10+dfsg-4build1, 2.9.10+dfsg-5, 2.9.10+dfsg-5ubuntu0.20.04.1, 2.9.10+dfsg-5ubuntu0.20.04.10, 2.9.10+dfsg-5ubuntu0.20.04.10+esm1, 2.9.10+dfsg-5ubuntu0.20.04.10+esm2, 2.9.10+dfsg-5ubuntu0.20.04.10+esm3, 2.9.10+dfsg-5ubuntu0.20.04.10+esm4, 2.9.10+dfsg-5ubuntu0.20.04.10+esm5, 2.9.10+dfsg-5ubuntu0.20.04.2, 2.9.10+dfsg-5ubuntu0.20.04.3, 2.9.10+dfsg-5ubuntu0.20.04.4, 2.9.10+dfsg-5ubuntu0.20.04.5, 2.9.10+dfsg-5ubuntu0.20.04.6, 2.9.10+dfsg-5ubuntu0.20.04.7, 2.9.10+dfsg-5ubuntu0.20.04.8, 2.9.10+dfsg-5ubuntu0.20.04.9, 2.9.12+dfsg-4, 2.9.12+dfsg-5, 2.9.12+dfsg-6, 2.9.13+dfsg-1, 2.9.13+dfsg-1build1, 2.9.13+dfsg-1ubuntu0.1, 2.9.13+dfsg-1ubuntu0.10, 2.9.13+dfsg-1ubuntu0.11, 2.9.13+dfsg-1ubuntu0.12, 2.9.13+dfsg-1ubuntu0.13, 2.9.13+dfsg-1ubuntu0.2, 2.9.13+dfsg-1ubuntu0.3, 2.9.13+dfsg-1ubuntu0.4, 2.9.13+dfsg-1ubuntu0.5, 2.9.13+dfsg-1ubuntu0.6, 2.9.13+dfsg-1ubuntu0.7, 2.9.13+dfsg-1ubuntu0.8, 2.9.13+dfsg-1ubuntu0.9, 2.9.14+dfsg-1.3, 2.9.14+dfsg-1.3build1, 2.9.14+dfsg-1.3build2, 2.9.14+dfsg-1.3build3, 2.9.14+dfsg-1.3ubuntu1, 2.9.14+dfsg-1.3ubuntu2, 2.9.14+dfsg-1.3ubuntu3, 2.9.14+dfsg-1.3ubuntu3.1, 2.9.14+dfsg-1.3ubuntu3.2, 2.9.14+dfsg-1.3ubuntu3.3, 2.9.14+dfsg-1.3ubuntu3.4, 2.9.14+dfsg-1.3ubuntu3.5, 2.9.14+dfsg-1.3ubuntu3.6, 2.9.14+dfsg-1.3ubuntu3.7, 2.9.14+dfsg-1.3ubuntu3.8, 2.9.14+dfsg-1.3ubuntu3.9, 2.9.2+zdfsg1-4, 2.9.2+zdfsg1-4ubuntu1, 2.9.2+zdfsg1-4ubuntu2, 2.9.2+zdfsg1-4ubuntu3, 2.9.3+dfsg1-1, 2.9.3+dfsg1-1ubuntu0.1, 2.9.3+dfsg1-1ubuntu0.2, 2.9.3+dfsg1-1ubuntu0.3, 2.9.3+dfsg1-1ubuntu0.4, 2.9.3+dfsg1-1ubuntu0.5, 2.9.3+dfsg1-1ubuntu0.6, 2.9.3+dfsg1-1ubuntu0.7, 2.9.3+dfsg1-1ubuntu0.7+esm1, 2.9.3+dfsg1-1ubuntu0.7+esm10, 2.9.3+dfsg1-1ubuntu0.7+esm11, 2.9.3+dfsg1-1ubuntu0.7+esm12, 2.9.3+dfsg1-1ubuntu0.7+esm13, 2.9.3+dfsg1-1ubuntu0.7+esm2, 2.9.3+dfsg1-1ubuntu0.7+esm3, 2.9.3+dfsg1-1ubuntu0.7+esm4, 2.9.3+dfsg1-1ubuntu0.7+esm5, 2.9.3+dfsg1-1ubuntu0.7+esm6, 2.9.3+dfsg1-1ubuntu0.7+esm7, 2.9.3+dfsg1-1ubuntu0.7+esm8, 2.9.3+dfsg1-1ubuntu0.7+esm9, 2.9.4+dfsg1-4ubuntu1, 2.9.4+dfsg1-5.1ubuntu1, 2.9.4+dfsg1-5.2ubuntu1, 2.9.4+dfsg1-5ubuntu1, 2.9.4+dfsg1-5ubuntu2, 2.9.4+dfsg1-6.1ubuntu1, 2.9.4+dfsg1-6.1ubuntu1.2, 2.9.4+dfsg1-6.1ubuntu1.3, 2.9.4+dfsg1-6.1ubuntu1.4, 2.9.4+dfsg1-6.1ubuntu1.5, 2.9.4+dfsg1-6.1ubuntu1.6, 2.9.4+dfsg1-6.1ubuntu1.7, 2.9.4+dfsg1-6.1ubuntu1.8, 2.9.4+dfsg1-6.1ubuntu1.9, 2.9.4+dfsg1-6.1ubuntu1.9+esm1, 2.9.4+dfsg1-6.1ubuntu1.9+esm2, 2.9.4+dfsg1-6.1ubuntu1.9+esm3, 2.9.4+dfsg1-6.1ubuntu1.9+esm4, 2.9.4+dfsg1-6.1ubuntu1.9+esm5, 2.9.4+dfsg1-6.1ubuntu1.9+esm6, 2.9.4+dfsg1-6.1ubuntu1.9+esm7, 2.9.4+dfsg1-6.1ubuntu1.9+esm8, 2.9.4+dfsg1-7ubuntu3, 2.9.4+dfsg1-7ubuntu5, 2.9.4+dfsg1-8ubuntu1, 2.9.4+dfsg1-8ubuntu2, 2.9.4+dfsg1-8ubuntu3
- Fixed versions
- 2.15.2+dfsg-0.1ubuntu0.3, 2.9.1+dfsg1-3ubuntu4.13+esm13, 2.9.10+dfsg-5ubuntu0.20.04.10+esm6, 2.9.13+dfsg-1ubuntu0.14, 2.9.14+dfsg-1.3ubuntu3.10, 2.9.3+dfsg1-1ubuntu0.7+esm14, 2.9.4+dfsg1-6.1ubuntu1.9+esm9
- CVEs
- CVE-2026-86143
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 10:44 UTC · Revision 1
Source evidence
In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.
osv:UBUNTU-CVE-2026-86143
libxml2
Fixed versions: 2.9.1+dfsg1-3ubuntu4.13+esm13
libxml2
Fixed versions: 2.9.3+dfsg1-1ubuntu0.7+esm14
libxml2
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+esm9
libxml2
Fixed versions: 2.9.10+dfsg-5ubuntu0.20.04.10+esm6
libxml2
Fixed versions: 2.9.13+dfsg-1ubuntu0.14
libxml2
Fixed versions: 2.9.14+dfsg-1.3ubuntu3.10
libxml2
Fixed versions: 2.15.2+dfsg-0.1ubuntu0.3
Complete source record
{
"id": "fcea0c975a70ddf763113d73d3479d394b7d1070e8ffe32ce11814a51f9c89b3",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-86143",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-86143",
"summary": "In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.",
"evidence": "osv:UBUNTU-CVE-2026-86143",
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"affected_versions": [
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{
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"evidence": "/affected/2/versions"
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{
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{
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{
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"evidence": "/affected/3/versions"
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{
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{
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"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.4",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.5",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.6",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.7",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.8",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.9",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.10",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.10+esm1",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.10+esm2",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.10+esm3",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.10+esm4",
"evidence": "/affected/3/versions"
},
{
"value": "2.9.10+dfsg-5ubuntu0.20.04.10+esm5",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "libxml2",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.13+dfsg-1ubuntu0.14",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": [
{
"value": "2.9.12+dfsg-4",
"evidence": "/affected/4/versions"
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{
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{
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{
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{
"binary_name": "python3-libxml2",
"binary_version": "2.15.2+dfsg-0.1ubuntu0.3"
}
],
"availability": "No subscription required"
}
}
],
"modified": "2026-10-09T07:45:02.935045913Z",
"provider": "osv",
"upstream": [
"CVE-2026-86143"
],
"references": [
"https://ubuntu.com/security/CVE-2026-86143",
"https://www.cve.org/CVERecord?id=CVE-2026-86143",
"https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1111",
"https://ubuntu.com/security/notices/USN-8910-1"
]
},
"related_cves": [
{
"value": "CVE-2026-86143",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 108947,
"published_at": "2026-09-05T05:17:00+00:00"
}