Medium
7zip, p7zip — security advisory
7-Zip is a file archiver with a high compression ratio. Versions 9.11 through 26.00 contain a heap out-of-bounds read of up to 3 bytes in the UDF disc image handler's File Identifier Descriptor parser. In CFileId::Parse (CPP/7zip/Archive/Udf/UdfIn.cpp), after validating size < 38 + idLen + impLen and advancing processed to 38 + impLen + idLen, the alignment-padding loop reads p[processed] while incrementing up to 3 times to reach a 4-byte boundary, and the processed <= size bounds check only runs after the loop. When (38 + impLen + idLen) % 4 != 0 and 38 + impLen + idLen == size, the loop reads 1 to 3 bytes past the end of the exact-size heap buffer allocated via buf.Alloc((size_t)item.Size). The UDF handler is registered for .iso and .udf files and auto-detected by signature, and the OOB read triggers during Open() when listing or extracting a crafted UDF image. Impact is limited to information disclosure (a 1-bit oracle per OOB byte via open/fail behavior) and denial of service (crash under hardened allocators); there is no write primitive. Version 26.01 fixes the issue.
- Products
- 7zip, p7zip
- Affected versions
- 16.02+dfsg-4, 16.02+dfsg-5, 16.02+dfsg-6, 16.02+dfsg-7, 16.02+dfsg-7build1, 16.02+dfsg-8, 21.03~beta+dfsg-6, 21.04~beta+dfsg-1, 21.06+dfsg-1, 21.07+dfsg-1, 21.07+dfsg-2, 21.07+dfsg-3, 21.07+dfsg-4, 21.07+dfsg-4ubuntu0.1~esm1, 23.01+dfsg-11, 23.01+dfsg-11ubuntu0.1~esm1, 23.01+dfsg-3, 23.01+dfsg-7, 23.01+dfsg-8, 24.09+dfsg-7, 24.09+dfsg-8, 25.00+dfsg-1, 25.01+dfsg-1, 25.01+dfsg-2, 25.01+dfsg-3, 25.01+dfsg-4, 25.01+dfsg-5, 26.00+dfsg-1, 26.01+dfsg-2, 26.01+dfsg-3, 26.02+dfsg-1, 26.02+dfsg-2, 9.20.1~dfsg.1-4, 9.20.1~dfsg.1-4+deb7u1build0.14.04.1, 9.20.1~dfsg.1-4+deb7u2build0.14.04.1, 9.20.1~dfsg.1-4+deb7u3build0.14.04.1, 9.20.1~dfsg.1-4.2, 9.20.1~dfsg.1-4.2ubuntu0.1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-48102
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:07 UTC · Revision 1
Source evidence
7-Zip is a file archiver with a high compression ratio. Versions 9.11 through 26.00 contain a heap out-of-bounds read of up to 3 bytes in the UDF disc image handler's File Identifier Descriptor parser. In CFileId::Parse (CPP/7zip/Archive/Udf/UdfIn.cpp), after validating size < 38 + idLen + impLen and advancing processed to 38 + impLen + idLen, the alignment-padding loop reads p[processed] while incrementing up to 3 times to reach a 4-byte boundary, and the processed <= size bounds check only runs after the loop. When (38 + impLen + idLen) % 4 != 0 and 38 + impLen + idLen == size, the loop reads 1 to 3 bytes past the end of the exact-size heap buffer allocated via buf.Alloc((size_t)item.Size). The UDF handler is registered for .iso and .udf files and auto-detected by signature, and the OOB read triggers during Open() when listing or extracting a crafted UDF image. Impact is limited to information disclosure (a 1-bit oracle per OOB byte via open/fail behavior) and denial of service (crash under hardened allocators); there is no write primitive. Version 26.01 fixes the issue.
osv:UBUNTU-CVE-2026-48102
p7zip
Fixed versions: Not specified
p7zip
Fixed versions: Not specified
p7zip
Fixed versions: Not specified
p7zip
Fixed versions: Not specified
p7zip
Fixed versions: Not specified
7zip
Fixed versions: Not specified
7zip
Fixed versions: Not specified
7zip
Fixed versions: Not specified
7zip
Fixed versions: Not specified
7zip
Fixed versions: Not specified
Complete source record
{
"id": "801e23672591c77900b556355a6172ae21394a73dbab8b6ca3628d73c78561ce",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-48102",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-48102",
"summary": "7-Zip is a file archiver with a high compression ratio. Versions 9.11 through 26.00 contain a heap out-of-bounds read of up to 3 bytes in the UDF disc image handler's File Identifier Descriptor parser. In CFileId::Parse (CPP/7zip/Archive/Udf/UdfIn.cpp), after validating size < 38 + idLen + impLen and advancing processed to 38 + impLen + idLen, the alignment-padding loop reads p[processed] while incrementing up to 3 times to reach a 4-byte boundary, and the processed <= size bounds check only runs after the loop. When (38 + impLen + idLen) % 4 != 0 and 38 + impLen + idLen == size, the loop reads 1 to 3 bytes past the end of the exact-size heap buffer allocated via buf.Alloc((size_t)item.Size). The UDF handler is registered for .iso and .udf files and auto-detected by signature, and the OOB read triggers during Open() when listing or extracting a crafted UDF image. Impact is limited to information disclosure (a 1-bit oracle per OOB byte via open/fail behavior) and denial of service (crash under hardened allocators); there is no write primitive. Version 26.01 fixes the issue.",
"evidence": "osv:UBUNTU-CVE-2026-48102",
"products": [
{
"name": {
"value": "p7zip",
"evidence": "/affected/0/package/name"
},
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{
"value": "9.20.1~dfsg.1-4",
"evidence": "/affected/0/versions"
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{
"value": "9.20.1~dfsg.1-4+deb7u1build0.14.04.1",
"evidence": "/affected/0/versions"
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{
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{
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{
"name": {
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{
"value": "9.20.1~dfsg.1-4.2",
"evidence": "/affected/1/versions"
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{
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{
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{
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{
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{
"name": {
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"affected_versions": [
{
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{
"value": "16.02+dfsg-7build1",
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{
"name": {
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{
"name": {
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"affected_versions": [
{
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{
"value": "21.04~beta+dfsg-1",
"evidence": "/affected/5/versions"
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{
"value": "21.06+dfsg-1",
"evidence": "/affected/5/versions"
},
{
"value": "21.07+dfsg-1",
"evidence": "/affected/5/versions"
},
{
"value": "21.07+dfsg-2",
"evidence": "/affected/5/versions"
},
{
"value": "21.07+dfsg-3",
"evidence": "/affected/5/versions"
},
{
"value": "21.07+dfsg-4",
"evidence": "/affected/5/versions"
},
{
"value": "21.07+dfsg-4ubuntu0.1~esm1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "7zip",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "23.01+dfsg-3",
"evidence": "/affected/6/versions"
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{
"value": "23.01+dfsg-7",
"evidence": "/affected/6/versions"
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{
"value": "23.01+dfsg-8",
"evidence": "/affected/6/versions"
},
{
"value": "23.01+dfsg-11",
"evidence": "/affected/6/versions"
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{
"value": "23.01+dfsg-11ubuntu0.1~esm1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "7zip",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "24.09+dfsg-7",
"evidence": "/affected/7/versions"
},
{
"value": "24.09+dfsg-8",
"evidence": "/affected/7/versions"
},
{
"value": "25.00+dfsg-1",
"evidence": "/affected/7/versions"
},
{
"value": "25.01+dfsg-1",
"evidence": "/affected/7/versions"
},
{
"value": "25.01+dfsg-2",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "7zip",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "26.00+dfsg-1",
"evidence": "/affected/8/versions"
},
{
"value": "26.01+dfsg-2",
"evidence": "/affected/8/versions"
},
{
"value": "26.01+dfsg-3",
"evidence": "/affected/8/versions"
},
{
"value": "26.02+dfsg-1",
"evidence": "/affected/8/versions"
},
{
"value": "26.02+dfsg-2",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "7zip",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "25.01+dfsg-2",
"evidence": "/affected/9/versions"
},
{
"value": "25.01+dfsg-3",
"evidence": "/affected/9/versions"
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{
"value": "25.01+dfsg-4",
"evidence": "/affected/9/versions"
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{
"value": "25.01+dfsg-5",
"evidence": "/affected/9/versions"
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{
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],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-48102",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
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},
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"9.20.1~dfsg.1-4+deb7u1build0.14.04.1",
"9.20.1~dfsg.1-4+deb7u2build0.14.04.1",
"9.20.1~dfsg.1-4+deb7u3build0.14.04.1"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
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},
{
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}
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}
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},
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},
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"ecosystem_specific": {
"binaries": [
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}
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{
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"package": {
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"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"16.02+dfsg-8"
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "p7zip",
"binary_version": "16.02+dfsg-8"
},
{
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}
},
{
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],
"package": {
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"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
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"21.04~beta+dfsg-1",
"21.06+dfsg-1",
"21.07+dfsg-1",
"21.07+dfsg-2",
"21.07+dfsg-3",
"21.07+dfsg-4",
"21.07+dfsg-4ubuntu0.1~esm1"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "7zip",
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},
{
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],
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},
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"23.01+dfsg-8",
"23.01+dfsg-11",
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],
"package": {
"name": "7zip",
"purl": "pkg:deb/ubuntu/7zip?arch=source&distro=questing",
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},
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"25.01+dfsg-2"
],
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},
"ecosystem_specific": {
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{
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},
{
"binary_name": "7zip-standalone",
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}
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}
},
{
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],
"package": {
"name": "7zip",
"purl": "pkg:deb/ubuntu/7zip?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
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"26.01+dfsg-2",
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],
"database_specific": {
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},
"ecosystem_specific": {
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{
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},
{
"binary_name": "7zip-standalone",
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}
]
}
},
{
"ranges": [
{
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],
"package": {
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"purl": "pkg:deb/ubuntu/7zip?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"25.01+dfsg-2",
"25.01+dfsg-3",
"25.01+dfsg-4",
"25.01+dfsg-5",
"26.00+dfsg-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48102.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "7zip",
"binary_version": "26.00+dfsg-1"
},
{
"binary_name": "7zip-standalone",
"binary_version": "26.00+dfsg-1"
}
]
}
}
],
"modified": "2026-10-17T13:00:22.535517905Z",
"provider": "osv",
"upstream": [
"CVE-2026-48102"
],
"references": [
"https://ubuntu.com/security/CVE-2026-48102",
"https://www.cve.org/CVERecord?id=CVE-2026-48102",
"https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/"
]
},
"related_cves": [
{
"value": "CVE-2026-48102",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360449,
"published_at": "2026-06-05T16:16:00+00:00"
}