Medium
7zip, p7zip — security advisory
7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 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-2026-48101
- 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 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.
osv:UBUNTU-CVE-2026-48101
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": "366dbffcd76ac671cfce7a82f7cfdbbb4c245f42cdb786b97b3b670b84c1dd9d",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-48101",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-48101",
"summary": "7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.",
"evidence": "osv:UBUNTU-CVE-2026-48101",
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{
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{
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{
"name": {
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{
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{
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{
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{
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{
"value": "21.07+dfsg-4ubuntu0.1~esm1",
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},
{
"name": {
"value": "7zip",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "23.01+dfsg-3",
"evidence": "/affected/6/versions"
},
{
"value": "23.01+dfsg-7",
"evidence": "/affected/6/versions"
},
{
"value": "23.01+dfsg-8",
"evidence": "/affected/6/versions"
},
{
"value": "23.01+dfsg-11",
"evidence": "/affected/6/versions"
},
{
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},
{
"name": {
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{
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"evidence": "/affected/7/versions"
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{
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"evidence": "/affected/7/versions"
},
{
"value": "25.00+dfsg-1",
"evidence": "/affected/7/versions"
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{
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"evidence": "/affected/7/versions"
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{
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{
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"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"
},
{
"value": "25.01+dfsg-4",
"evidence": "/affected/9/versions"
},
{
"value": "25.01+dfsg-5",
"evidence": "/affected/9/versions"
},
{
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],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-48101",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"
},
{
"type": "Ubuntu",
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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",
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},
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"ecosystem_specific": {
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"21.06+dfsg-1",
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"21.07+dfsg-3",
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},
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},
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},
{
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"ecosystem": "Ubuntu:26.04:LTS"
},
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},
"ecosystem_specific": {
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]
}
}
],
"modified": "2026-10-17T13:00:22.623778569Z",
"provider": "osv",
"upstream": [
"CVE-2026-48101"
],
"references": [
"https://ubuntu.com/security/CVE-2026-48101",
"https://www.cve.org/CVERecord?id=CVE-2026-48101",
"https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/"
]
},
"related_cves": [
{
"value": "CVE-2026-48101",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360450,
"published_at": "2026-06-05T16:16:00+00:00"
}