High
Security advisory
There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-3516
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 12:38 UTC · Revision 1
Source evidence
There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.
osv:CVE-2021-3516
Complete source record
{
"id": "1c316e4419a2aebf376444e26f4763e12488685895a839747a6baf9004b680ca",
"url": "https://osv.dev/vulnerability/CVE-2021-3516",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-3516",
"summary": "There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to confidentiality, integrity, and availability.",
"evidence": "osv:CVE-2021-3516",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2021-3516",
"aliases": [
"CVE-2021-3516"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://gitlab.gnome.org/gnome/libxml2",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "e1bcffea180d6cc0651757bb64284a763e0e2239"
},
{
"introduced": "2189b59b1005976970ebadb65edbb289f9e091ff"
},
{
"last_affected": "2189b59b1005976970ebadb65edbb289f9e091ff"
},
{
"fixed": "1358d157d0bd83be1dfe356a69213df9fac0b539"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:xmlsoft:xmllint:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.9.11"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "6.0"
},
{
"last_affected": "6.0"
}
],
"source": "CPE_STRING"
},
{
"range": [
{
"fixed": "1358d157d0bd83be1dfe356a69213df9fac0b539"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
"versions": [
"6.0",
"LIBXML2_6_0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3516.json",
"vanir_signatures": [
{
"id": "CVE-2021-3516-22c624ac",
"digest": {
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"187480151731575691958788539215601771876",
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]
},
"source": "https://gitlab.gnome.org/gnome/libxml2@1358d157d0bd83be1dfe356a69213df9fac0b539",
"target": {
"file": "xmllint.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2021-3516-5d358667",
"digest": {
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},
"source": "https://gitlab.gnome.org/gnome/libxml2@e1bcffea180d6cc0651757bb64284a763e0e2239",
"target": {
"file": "testapi.c"
},
"deprecated": false,
"signature_type": "Line",
"signature_version": "v1"
},
{
"id": "CVE-2021-3516-88b79f4c",
"digest": {
"length": 1155,
"function_hash": "198329610838053062539893085088781189951"
},
"source": "https://gitlab.gnome.org/gnome/libxml2@e1bcffea180d6cc0651757bb64284a763e0e2239",
"target": {
"file": "testapi.c",
"function": "test_xmlIO"
},
"deprecated": false,
"signature_type": "Function",
"signature_version": "v1"
}
],
"vanir_signatures_modified": "2026-10-20T14:09:46Z"
}
}
],
"modified": "2026-10-20T14:09:46.990043172Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-398330.html",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/",
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/",
"https://lists.debian.org/debian-lts-announce/2021/05/msg00008.html",
"https://security.gentoo.org/glsa/202107-05",
"https://security.netapp.com/advisory/ntap-20210716-0005/",
"https://bugzilla.redhat.com/show_bug.cgi?id=1954225",
"https://gitlab.gnome.org/GNOME/libxml2/-/issues/230",
"https://gitlab.gnome.org/GNOME/libxml2/-/commit/1358d157d0bd83be1dfe356a69213df9fac0b539",
"https://www.oracle.com/security-alerts/cpujan2022.html"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
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"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
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},
{
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},
{
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},
{
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}
],
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]
},
{
"cpes": [
"cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*"
],
"vendor_product": "oracle:zfs_storage_appliance_kit",
"extracted_events": [
{
"range": [
{
"introduced": "8.8"
},
{
"last_affected": "8.8"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
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"cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux",
"extracted_events": [
{
"range": [
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
},
{
"introduced": "8.0"
},
{
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}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-3516",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 388600,
"published_at": "2021-06-01T14:15:10.373+00:00"
}