UnratedFix available
Fix CVE(s): CVE-2026-86138
Type: advisorySources: OSV
* SECURITY UPDATE: integer overflow leading to heap buffer overflow in xmlDictAddQString - debian/patches/CVE-2026-86138.patch: add overflow checks for pool size calculations in xmlDictAddQString() and its sibling xmlDictAddString(), and cap the QName length in xmlDictQLookup(), in dict.c - CVE-2026-86138
- Products
- libxml2, libxml2-dev, libxml2-doc, libxml2-utils, python-libxml2
- Affected versions
- Not specified
- Fixed versions
- 2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15
- CVEs
- CVE-2026-86138
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:40 UTC · Revision 1
Source evidence
* SECURITY UPDATE: integer overflow leading to heap buffer overflow in xmlDictAddQString - debian/patches/CVE-2026-86138.patch: add overflow checks for pool size calculations in xmlDictAddQString() and its sibling xmlDictAddString(), and cap the QName length in xmlDictQLookup(), in dict.c - CVE-2026-86138
osv:CLSA-2026-1789384426
libxml2
Fixed versions: 2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15
libxml2-dev
Fixed versions: 2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15
libxml2-doc
Fixed versions: 2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15
libxml2-utils
Fixed versions: 2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15
python-libxml2
Fixed versions: 2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15
Complete source record
{
"id": "5ca857d847b5be6c9646edb67e388e0ba47c04b7892926591614e5ab774942bd",
"url": "https://osv.dev/vulnerability/CLSA-2026-1789384426",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-86138",
"summary": "* SECURITY UPDATE: integer overflow leading to heap buffer overflow in xmlDictAddQString - debian/patches/CVE-2026-86138.patch: add overflow checks for pool size calculations in xmlDictAddQString() and its sibling xmlDictAddString(), and cap the QName length in xmlDictQLookup(), in dict.c - CVE-2026-86138",
"evidence": "osv:CLSA-2026-1789384426",
"products": [
{
"name": {
"value": "libxml2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libxml2-dev",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libxml2-doc",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libxml2-utils",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-libxml2",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1789384426",
"aliases": [
"CLSA-2026-1789384426"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15"
}
]
}
],
"package": {
"name": "libxml2",
"purl": "pkg:deb/tuxcare/libxml2?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1789384426.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15"
}
]
}
],
"package": {
"name": "libxml2-dev",
"purl": "pkg:deb/tuxcare/libxml2-dev?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1789384426.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15"
}
]
}
],
"package": {
"name": "libxml2-doc",
"purl": "pkg:deb/tuxcare/libxml2-doc?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1789384426.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15"
}
]
}
],
"package": {
"name": "libxml2-utils",
"purl": "pkg:deb/tuxcare/libxml2-utils?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1789384426.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.3+dfsg1-1ubuntu0.7+tuxcare.els15"
}
]
}
],
"package": {
"name": "python-libxml2",
"purl": "pkg:deb/tuxcare/python-libxml2?distro=ubuntu-16.04",
"ecosystem": "TuxCare:Ubuntu:16.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu16.04els/CLSA-2026-1789384426.json"
}
}
],
"modified": "2026-10-26T09:32:02.673243828Z",
"provider": "osv",
"upstream": [
"CVE-2026-86138"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu16.04els/CLSA-2026-1789384426.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-86138"
]
},
"related_cves": [
{
"value": "CVE-2026-86138",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449462,
"published_at": "2026-09-14T11:14:01+00:00"
}