HighFix available
libarchive — security advisory
A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.
- Products
- libarchive
- Affected versions
- 3.6.2-1, 3.6.2-1+deb12u1, 3.6.2-1+deb12u2, 3.6.2-1+deb12u3, 3.7.4-4, 3.8.4-1, 3.8.5-1, 3.8.6-1
- Fixed versions
- 3.6.2-1+deb12u4, 3.7.4-4+deb13u1, 3.8.7-1
- CVEs
- CVE-2026-5121
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 16:16 UTC · Revision 1
Source evidence
A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.
osv:DEBIAN-CVE-2026-5121
libarchive
Fixed versions: 3.6.2-1+deb12u4
libarchive
Fixed versions: 3.7.4-4+deb13u1
libarchive
Fixed versions: 3.8.7-1
Complete source record
{
"id": "14557baaefddfdee4a5d992a78fb83fa4ed1e4b1bf9f6efd4a9ca4d7e2fcba7a",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-5121",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-5121",
"summary": "A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.",
"evidence": "osv:DEBIAN-CVE-2026-5121",
"products": [
{
"name": {
"value": "libarchive",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.6.2-1+deb12u4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "3.6.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.6.2-1+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "3.6.2-1+deb12u2",
"evidence": "/affected/0/versions"
},
{
"value": "3.6.2-1+deb12u3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libarchive",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.7.4-4+deb13u1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "3.7.4-4",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libarchive",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.8.7-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "3.7.4-4",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.4-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "3.8.6-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-5121",
"aliases": [
"DEBIAN-CVE-2026-5121"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.6.2-1+deb12u4"
}
]
}
],
"package": {
"name": "libarchive",
"purl": "pkg:deb/debian/libarchive?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"3.6.2-1",
"3.6.2-1+deb12u1",
"3.6.2-1+deb12u2",
"3.6.2-1+deb12u3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5121.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.7.4-4+deb13u1"
}
]
}
],
"package": {
"name": "libarchive",
"purl": "pkg:deb/debian/libarchive?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.7.4-4"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5121.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.8.7-1"
}
]
}
],
"package": {
"name": "libarchive",
"purl": "pkg:deb/debian/libarchive?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"3.7.4-4",
"3.8.4-1",
"3.8.5-1",
"3.8.6-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5121.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-15T09:47:27.092957726Z",
"provider": "osv",
"upstream": [
"CVE-2026-5121"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-5121"
]
},
"related_cves": [
{
"value": "CVE-2026-5121",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 327332,
"published_at": "2026-03-30T08:16:18.78+00:00"
}