MediumFix available
libebml — security advisory
A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.
- Products
- libebml
- Affected versions
- Not specified
- Fixed versions
- 1.4.2-1
- CVEs
- CVE-2021-3405
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:57 UTC · Revision 1
Source evidence
A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.
osv:DEBIAN-CVE-2021-3405
libebml
Fixed versions: 1.4.2-1
libebml
Fixed versions: 1.4.2-1
libebml
Fixed versions: 1.4.2-1
Complete source record
{
"id": "731d4774e70fc7f86d6b7c2d42db283da5075f26f8c7e43448632a1171689a05",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2021-3405",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2021-3405",
"summary": "A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.",
"evidence": "osv:DEBIAN-CVE-2021-3405",
"products": [
{
"name": {
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"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
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"value": "1.4.2-1",
"evidence": "/affected/0/ranges"
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{
"name": {
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{
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"severity": "medium",
"structured": {
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"aliases": [
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"metrics": [
{
"type": "CVSS_V3",
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}
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"affected": [
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"purl": "pkg:deb/debian/libebml?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
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"ecosystem": "Debian:13"
},
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"package": {
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},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-3405.json"
},
"ecosystem_specific": {
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}
}
],
"modified": "2026-10-23T18:02:30.145964244Z",
"provider": "osv",
"upstream": [
"CVE-2021-3405"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2021-3405"
]
},
"related_cves": [
{
"value": "CVE-2021-3405",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 419545,
"published_at": "2021-02-23T20:15:12.087+00:00"
}