UBUNTU-CVE-2026-48095

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-48095
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48095.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-48095
Upstream
  • CVE-2026-48095
Published
2026-06-05T15:16:00Z
Modified
2026-06-12T09:04:20.247903123Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing attackers to cause arbitrary code execution or application crashes. CInStream::GetCuSize() in the NTFS handler computes the compression-unit buffer size as (UInt32)1 << (BlockSizeLog + CompressionUnit), and a crafted image with ClusterSizeLog >= 28 and CompressionUnit == 4 drives the exponent to 32, which is undefined behavior and collapses on x86/x64 so inBuf is allocated as 1 byte. ReadStreamFALSE then writes up to 256 MB of attacker-controlled data into that 1-byte buffer in 64 KB iterations, and because the CInStream object sits only 304 bytes after _inBuf, its vtable pointer is overwritten and the next dispatched call achieves a vtable hijack. On 32-bit builds the overflow is unconditionally reached; on 64-bit it requires the parallel 8 GB _outBuf allocation to succeed, otherwise failing closed to denial of service. The NTFS handler is enabled by default in stock 7z.dll and, via signature-based fallback matching "NTFS " at offset 3, will open a crafted image regardless of file extension during extraction or testing. Version 26.01 fixes the issue.

References

Affected packages

Ubuntu:14.04:LTS
p7zip

Package

Name
p7zip
Purl
pkg:deb/ubuntu/p7zip?arch=source&distro=trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
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+deb7u3build0.14.04.1"
        },
        {
            "binary_name": "p7zip-full",
            "binary_version": "9.20.1~dfsg.1-4+deb7u3build0.14.04.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48095.json"
Ubuntu:16.04:LTS
p7zip

Package

Name
p7zip
Purl
pkg:deb/ubuntu/p7zip?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.20.1~dfsg.1-4.2
9.20.1~dfsg.1-4.2ubuntu0.1

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48095.json"
Ubuntu:18.04:LTS
p7zip

Package

Name
p7zip
Purl
pkg:deb/ubuntu/p7zip?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

16.*
16.02+dfsg-4
16.02+dfsg-5
16.02+dfsg-6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "p7zip",
            "binary_version": "16.02+dfsg-6"
        },
        {
            "binary_name": "p7zip-full",
            "binary_version": "16.02+dfsg-6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48095.json"
Ubuntu:20.04:LTS
p7zip

Package

Name
p7zip
Purl
pkg:deb/ubuntu/p7zip?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

16.*
16.02+dfsg-7
16.02+dfsg-7build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "p7zip",
            "binary_version": "16.02+dfsg-7build1"
        },
        {
            "binary_name": "p7zip-full",
            "binary_version": "16.02+dfsg-7build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48095.json"
Ubuntu:22.04:LTS
p7zip

Package

Name
p7zip
Purl
pkg:deb/ubuntu/p7zip?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

16.*
16.02+dfsg-8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "p7zip",
            "binary_version": "16.02+dfsg-8"
        },
        {
            "binary_name": "p7zip-full",
            "binary_version": "16.02+dfsg-8"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48095.json"
Ubuntu:25.10
7zip

Package

Name
7zip
Purl
pkg:deb/ubuntu/7zip?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

24.*
24.09+dfsg-7
24.09+dfsg-8
25.*
25.00+dfsg-1
25.01+dfsg-1
25.01+dfsg-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "7zip",
            "binary_version": "25.01+dfsg-2"
        },
        {
            "binary_name": "7zip-standalone",
            "binary_version": "25.01+dfsg-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48095.json"
Ubuntu:26.04:LTS
7zip

Package

Name
7zip
Purl
pkg:deb/ubuntu/7zip?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

25.*
25.01+dfsg-2
25.01+dfsg-3
25.01+dfsg-4
25.01+dfsg-5
26.*
26.00+dfsg-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "7zip",
            "binary_version": "26.00+dfsg-1"
        },
        {
            "binary_name": "7zip-standalone",
            "binary_version": "26.00+dfsg-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48095.json"
Ubuntu:Pro:22.04:LTS
7zip

Package

Name
7zip
Purl
pkg:deb/ubuntu/7zip?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

21.*
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": "21.07+dfsg-4ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48095.json"
Ubuntu:Pro:24.04:LTS
7zip

Package

Name
7zip
Purl
pkg:deb/ubuntu/7zip?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

23.*
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": "23.01+dfsg-11ubuntu0.1~esm1"
        },
        {
            "binary_name": "7zip-standalone",
            "binary_version": "23.01+dfsg-11ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-48095.json"