UnratedFix available
Fix CVE(s): CVE-2026-11979
Type: advisorySources: OSV
* SECURITY UPDATE: stack-based buffer overflows in the xmlcatalog utility interactive --shell mode - debian/patches/CVE-2026-11979.patch: Add bounds checks in usershell() in xmlcatalog.c so the command, arg and argv fixed-size stack buffers are not overflowed by an overly long --shell input line - CVE-2026-11979
- 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.els8
- CVEs
- CVE-2026-11979
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:41 UTC · Revision 1
Source evidence
* SECURITY UPDATE: stack-based buffer overflows in the xmlcatalog utility interactive --shell mode - debian/patches/CVE-2026-11979.patch: Add bounds checks in usershell() in xmlcatalog.c so the command, arg and argv fixed-size stack buffers are not overflowed by an overly long --shell input line - CVE-2026-11979
osv:CLSA-2026-1783006034
libxml2
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8
libxml2-dev
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8
libxml2-doc
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8
libxml2-utils
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8
python-libxml2
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8
python3-libxml2
Fixed versions: 2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8
Complete source record
{
"id": "4eca5f208846ff9d8c051553594363bd7043c9cd9359e41a5c107cba04d66edf",
"url": "https://osv.dev/vulnerability/CLSA-2026-1783006034",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-11979",
"summary": "* SECURITY UPDATE: stack-based buffer overflows in the xmlcatalog utility interactive --shell mode - debian/patches/CVE-2026-11979.patch: Add bounds checks in usershell() in xmlcatalog.c so the command, arg and argv fixed-size stack buffers are not overflowed by an overly long --shell input line - CVE-2026-11979",
"evidence": "osv:CLSA-2026-1783006034",
"products": [
{
"name": {
"value": "libxml2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8",
"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.els8",
"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.els8",
"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.els8",
"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.els8",
"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.els8",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1783006034",
"aliases": [
"CLSA-2026-1783006034"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8"
}
]
}
],
"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-2026-1783006034.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8"
}
]
}
],
"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-2026-1783006034.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8"
}
]
}
],
"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-2026-1783006034.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8"
}
]
}
],
"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-2026-1783006034.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8"
}
]
}
],
"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-2026-1783006034.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.4+dfsg1-6.1ubuntu1.9+tuxcare.els8"
}
]
}
],
"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-2026-1783006034.json"
}
}
],
"modified": "2026-10-26T09:32:03.332130228Z",
"provider": "osv",
"upstream": [
"CVE-2026-11979"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu18.04els/CLSA-2026-1783006034.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-11979"
]
},
"related_cves": [
{
"value": "CVE-2026-11979",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449517,
"published_at": "2026-07-02T15:27:30+00:00"
}