Medium
Libvirt: denial of service in xml parsing
Type: advisorySources: OSV
A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML files was performed before the ACL checks. A malicious user with limited permissions could exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting in a denial-of-service condition.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-12748
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 08:50 UTC · Revision 1
Source evidence
A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML files was performed before the ACL checks. A malicious user with limited permissions could exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting in a denial-of-service condition.
osv:CVE-2025-12748
Complete source record
{
"id": "8b51025ec0fcfd4a55a38502a64d3dfbc67b9f6e96e124025b6ec60c0e299d13",
"url": "https://osv.dev/vulnerability/CVE-2025-12748",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Libvirt: denial of service in xml parsing",
"summary": "A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML files was performed before the ACL checks. A malicious user with limited permissions could exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting in a denial-of-service condition.",
"evidence": "osv:CVE-2025-12748",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-12748",
"aliases": [
"CVE-2025-12748"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://gitlab.com/libvirt/libvirt",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "91f3e8b667a35874f234cc8b2e56805f0a8b4a63"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "11.9.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
}
]
}
}
],
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"LIBVIRT_0_1_6",
"v0.1.4",
"LIBVIRT_0_1_4",
"v0.1.3",
"LIBVIRT_0_1_3",
"v0.1.1",
"LIBVIRT_0_1_1",
"v0.1.0",
"LIBVIRT_0_1_0",
"v0.0.5",
"LIBVIRT_0_0_5",
"v0.0.4",
"LIBVIRT_0_0_4",
"v0.0.3",
"LIBVIRT_0_0_3",
"v0.0.2",
"LIBVIR_0_0_2",
"v0.0.1",
"LIBVIR_0_0_1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-12748.json"
}
}
],
"modified": "2026-10-28T02:30:27.264975679Z",
"provider": "osv",
"references": [
"https://access.redhat.com/downloads/content/package-browser/",
"https://access.redhat.com/errata/RHSA-2026:18326",
"https://access.redhat.com/errata/RHSA-2026:18748",
"https://access.redhat.com/security/cve/CVE-2025-12748",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/12xxx/CVE-2025-12748.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-12748",
"https://bugzilla.redhat.com/show_bug.cgi?id=2413801",
"https://gitlab.com/libvirt/libvirt"
],
"provider_metadata": {
"cwe_ids": [
"CWE-770"
],
"cna_assigner": "redhat",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "0:11.10.0-12.el10_2"
},
{
"fixed": "0:11.10.0-12.el9_8"
}
],
"source": "AFFECTED_FIELD",
"strategy": "InverseAffectedRanges"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/12xxx/CVE-2025-12748.json"
}
},
"related_cves": [
{
"value": "CVE-2025-12748",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 493975,
"published_at": "2025-11-11T19:49:32.255+00:00"
}