ubuntu-cve-2026-48103
Vulnerability from osv_ubuntu
Published
2026-06-05 17:16
Modified
2026-06-11 13:06
Summary
Details
7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain an off-by-one heap out-of-bounds read in the WIM (Windows Imaging) archive handler's security descriptor lookup. In CHandler::GetSecurity (CPP/7zip/Archive/Wim/WimHandler.cpp), the per-image SecurOffsets table holds numEntries + 1 cumulative offsets, but the check securityId >= SecurOffsets.Size() admits securityId == numEntries, and the function then reads SecurOffsets[securityId + 1], fetching one UInt32 past the end of the heap-allocated CRecordVector (which performs no bounds checking on operator[]). The securityId is attacker-controlled at offset +0xC of any directory entry in WIM metadata, and the handler is registered for .wim, .swm, .esd, and .ppkg and enabled by default in stock 7z.dll; the OOB triggers zero-click in the GUI because 7zFM.exe's ListView calls GetRawProp(kpidNtSecure) for every item during listing (ASan-confirmed), and is also reachable via CLI listing with 7zz l -slt. Impact is limited to denial of service under hardened allocators and minor information disclosure, since the OOB value is only consumed arithmetically as a length and is not surfaced to the attacker; there is no write primitive.
Severity
4.3 (Medium)
7.1 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "p7zip",
"binary_version": "9.20.1~dfsg.1-4+deb7u3build0.14.04.1"
},
{
"binary_name": "p7zip-full",
"binary_version": "9.20.1~dfsg.1-4+deb7u3build0.14.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "p7zip",
"purl": "pkg:deb/ubuntu/p7zip@9.20.1~dfsg.1-4+deb7u3build0.14.04.1?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "p7zip",
"binary_version": "9.20.1~dfsg.1-4.2ubuntu0.1"
},
{
"binary_name": "p7zip-full",
"binary_version": "9.20.1~dfsg.1-4.2ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "p7zip",
"purl": "pkg:deb/ubuntu/p7zip@9.20.1~dfsg.1-4.2ubuntu0.1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"9.20.1~dfsg.1-4.2",
"9.20.1~dfsg.1-4.2ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "p7zip",
"binary_version": "16.02+dfsg-6"
},
{
"binary_name": "p7zip-full",
"binary_version": "16.02+dfsg-6"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "p7zip",
"purl": "pkg:deb/ubuntu/p7zip@16.02+dfsg-6?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"16.02+dfsg-4",
"16.02+dfsg-5",
"16.02+dfsg-6"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "p7zip",
"binary_version": "16.02+dfsg-7build1"
},
{
"binary_name": "p7zip-full",
"binary_version": "16.02+dfsg-7build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "p7zip",
"purl": "pkg:deb/ubuntu/p7zip@16.02+dfsg-7build1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"16.02+dfsg-7",
"16.02+dfsg-7build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "p7zip",
"binary_version": "16.02+dfsg-8"
},
{
"binary_name": "p7zip-full",
"binary_version": "16.02+dfsg-8"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "p7zip",
"purl": "pkg:deb/ubuntu/p7zip@16.02+dfsg-8?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"16.02+dfsg-8"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "7zip",
"binary_version": "21.07+dfsg-4ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "7zip",
"purl": "pkg:deb/ubuntu/7zip@21.07+dfsg-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "7zip",
"binary_version": "23.01+dfsg-11ubuntu0.1~esm1"
},
{
"binary_name": "7zip-standalone",
"binary_version": "23.01+dfsg-11ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "7zip",
"purl": "pkg:deb/ubuntu/7zip@23.01+dfsg-11ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"23.01+dfsg-3",
"23.01+dfsg-7",
"23.01+dfsg-8",
"23.01+dfsg-11",
"23.01+dfsg-11ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "7zip",
"binary_version": "25.01+dfsg-2"
},
{
"binary_name": "7zip-standalone",
"binary_version": "25.01+dfsg-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "7zip",
"purl": "pkg:deb/ubuntu/7zip@25.01+dfsg-2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"24.09+dfsg-7",
"24.09+dfsg-8",
"25.00+dfsg-1",
"25.01+dfsg-1",
"25.01+dfsg-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "7zip",
"binary_version": "26.00+dfsg-1"
},
{
"binary_name": "7zip-standalone",
"binary_version": "26.00+dfsg-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "7zip",
"purl": "pkg:deb/ubuntu/7zip@26.00+dfsg-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"25.01+dfsg-2",
"25.01+dfsg-3",
"25.01+dfsg-4",
"25.01+dfsg-5",
"26.00+dfsg-1"
]
}
],
"aliases": [],
"details": "7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain an off-by-one heap out-of-bounds read in the WIM (Windows Imaging) archive handler\u0027s security descriptor lookup. In CHandler::GetSecurity (CPP/7zip/Archive/Wim/WimHandler.cpp), the per-image SecurOffsets table holds numEntries + 1 cumulative offsets, but the check securityId \u003e= SecurOffsets.Size() admits securityId == numEntries, and the function then reads SecurOffsets[securityId + 1], fetching one UInt32 past the end of the heap-allocated CRecordVector (which performs no bounds checking on operator[]). The securityId is attacker-controlled at offset +0xC of any directory entry in WIM metadata, and the handler is registered for .wim, .swm, .esd, and .ppkg and enabled by default in stock 7z.dll; the OOB triggers zero-click in the GUI because 7zFM.exe\u0027s ListView calls GetRawProp(kpidNtSecure) for every item during listing (ASan-confirmed), and is also reachable via CLI listing with 7zz l -slt. Impact is limited to denial of service under hardened allocators and minor information disclosure, since the OOB value is only consumed arithmetically as a length and is not surfaced to the attacker; there is no write primitive.",
"id": "UBUNTU-CVE-2026-48103",
"modified": "2026-06-11T13:06:29Z",
"published": "2026-06-05T17:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-48103"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-48103"
},
{
"type": "REPORT",
"url": "https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-48103"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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