HighFix available
expat, libxmltok — security advisory
In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.
- Products
- expat, libxmltok
- Affected versions
- 1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2
- Fixed versions
- 2.5.0-1
- CVEs
- CVE-2022-43680
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 16:37 UTC · Revision 1
Source evidence
In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.
osv:DEBIAN-CVE-2022-43680
expat
Fixed versions: 2.5.0-1
expat
Fixed versions: 2.5.0-1
expat
Fixed versions: 2.5.0-1
libxmltok
Fixed versions: Not specified
Complete source record
{
"id": "df02116fedf394839c0cb50d17b8fa04355ac592b9e52525b527e89397e59fab",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2022-43680",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2022-43680",
"summary": "In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEntityParserCreate in out-of-memory situations.",
"evidence": "osv:DEBIAN-CVE-2022-43680",
"products": [
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{
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"affected_versions": [
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{
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"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
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{
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"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2022-43680",
"aliases": [
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"metrics": [
{
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{
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"package": {
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{
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"package": {
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"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-43680.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
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"events": [
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}
],
"package": {
"name": "libxmltok",
"purl": "pkg:deb/debian/libxmltok?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.2-4",
"1.2-4.1",
"1.2-4.1~exp1",
"1.2-4.2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2022-43680.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
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}
],
"modified": "2026-10-15T09:47:35.008071404Z",
"provider": "osv",
"upstream": [
"CVE-2022-43680"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2022-43680"
]
},
"related_cves": [
{
"value": "CVE-2022-43680",
"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 327781,
"published_at": "2022-10-24T14:15:53.323+00:00"
}