UnratedFix available
Fix CVE(s): CVE-2026-86140
Type: advisorySources: OSV
* SECURITY UPDATE: stack-based buffer overflow in xmlSnprintfElements() - debian/patches/CVE-2026-86140.patch: add the missing remaining-space checks around the strcat() calls that wrap the node loop in xmlSnprintfElements() in valid.c, matching the guards CVE-2025-24928 already added to xmlSnprintfElementContent() - CVE-2026-86140
- Products
- libxml2, libxml2-dev, libxml2-doc, libxml2-utils, python-libxml2, python3-libxml2
- Affected versions
- Not specified
- Fixed versions
- 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9
- CVEs
- CVE-2025-24928, CVE-2026-86140
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:56 UTC · Revision 1
Source evidence
* SECURITY UPDATE: stack-based buffer overflow in xmlSnprintfElements() - debian/patches/CVE-2026-86140.patch: add the missing remaining-space checks around the strcat() calls that wrap the node loop in xmlSnprintfElements() in valid.c, matching the guards CVE-2025-24928 already added to xmlSnprintfElementContent() - CVE-2026-86140
osv:CLSA-2026-1789463267
libxml2
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9
libxml2-dev
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9
libxml2-doc
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9
libxml2-utils
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9
python-libxml2
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9
python3-libxml2
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9
Complete source record
{
"id": "c9f310c6001fa549bcb75720d838209096089dc95b783a463fa4f9aa4133fc25",
"url": "https://osv.dev/vulnerability/CLSA-2026-1789463267",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-86140",
"summary": "* SECURITY UPDATE: stack-based buffer overflow in xmlSnprintfElements() - debian/patches/CVE-2026-86140.patch: add the missing remaining-space checks around the strcat() calls that wrap the node loop in xmlSnprintfElements() in valid.c, matching the guards CVE-2025-24928 already added to xmlSnprintfElementContent() - CVE-2026-86140",
"evidence": "osv:CLSA-2026-1789463267",
"products": [
{
"name": {
"value": "libxml2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libxml2-dev",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libxml2-doc",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libxml2-utils",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-libxml2",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3-libxml2",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1789463267",
"aliases": [
"CLSA-2026-1789463267"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9"
}
]
}
],
"package": {
"name": "libxml2",
"purl": "pkg:deb/tuxcare/libxml2?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1789463267.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9"
}
]
}
],
"package": {
"name": "libxml2-dev",
"purl": "pkg:deb/tuxcare/libxml2-dev?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1789463267.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9"
}
]
}
],
"package": {
"name": "libxml2-doc",
"purl": "pkg:deb/tuxcare/libxml2-doc?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1789463267.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9"
}
]
}
],
"package": {
"name": "libxml2-utils",
"purl": "pkg:deb/tuxcare/libxml2-utils?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1789463267.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9"
}
]
}
],
"package": {
"name": "python-libxml2",
"purl": "pkg:deb/tuxcare/python-libxml2?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1789463267.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els9"
}
]
}
],
"package": {
"name": "python3-libxml2",
"purl": "pkg:deb/tuxcare/python3-libxml2?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1789463267.json"
}
}
],
"modified": "2026-10-26T09:43:48.998797917Z",
"provider": "osv",
"upstream": [
"CVE-2025-24928",
"CVE-2026-86140"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu18.04els/CLSA-2026-1789463267.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-86140"
]
},
"related_cves": [
{
"value": "CVE-2025-24928",
"evidence": "/upstream"
},
{
"value": "CVE-2026-86140",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 450164,
"published_at": "2026-09-15T09:07:57+00:00"
}